155231215 has 8 divisors (see below), whose sum is σ = 188829648. Its totient is φ = 122483520.

The previous prime is 155231143. The next prime is 155231227. The reversal of 155231215 is 512132551.

155231215 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 155231215 - 2¹³ = 155223023 is a prime.

It is a super-2 number, since 2×155231215² = 48193460220752450, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 155231215.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 212281 + ... + 213010.

It is an arithmetic number, because the mean of its divisors is an integer number (23603706).

Almost surely, 2^155231215 is an apocalyptic number.

155231215 is a deficient number, since it is larger than the sum of its proper divisors (33598433).

155231215 is an equidigital number, since it uses as much as digits as its factorization.

155231215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425369.

The product of its digits is 1500, while the sum is 25.

The square root of 155231215 is about 12459.1819554897. The cubic root of 155231215 is about 537.4355026269.

Adding to 155231215 its reverse (512132551), we get a palindrome (667363766).

The spelling of 155231215 in words is "one hundred fifty-five million, two hundred thirty-one thousand, two hundred fifteen".