155117 has 4 divisors (see below), whose sum is σ = 156156. Its totient is φ = 154080.

The previous prime is 155087. The next prime is 155119. The reversal of 155117 is 711551.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 711551 = 23 ⋅30937.

It can be written as a sum of positive squares in 2 ways, for example, as 64516 + 90601 = 254^2 + 301^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155117 is a prime.

It is a super-2 number, since 2×155117² = 48122567378, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 155117.

It is not an unprimeable number, because it can be changed into a prime (155119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 248 + ... + 609.

It is an arithmetic number, because the mean of its divisors is an integer number (39039).

2¹⁵⁵¹¹⁷ is an apocalyptic number.

It is an amenable number.

155117 is a deficient number, since it is larger than the sum of its proper divisors (1039).

155117 is an equidigital number, since it uses as much as digits as its factorization.

155117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1038.

The product of its digits is 175, while the sum is 20.

The square root of 155117 is about 393.8489558194. The cubic root of 155117 is about 53.7303660036.

Adding to 155117 its reverse (711551), we get a palindrome (866668).

It can be divided in two parts, 155 and 117, that added together give a palindrome (272).

The spelling of 155117 in words is "one hundred fifty-five thousand, one hundred seventeen".