155001 has 24 divisors (see below), whose sum is σ = 263872. Its totient is φ = 79200.

The previous prime is 154991. The next prime is 155003. The reversal of 155001 is 100551.

155001 is an esthetic number in base 3, because in such base its adjacent digits differ by 1.

It is not a de Polignac number, because 155001 - 2⁶ = 154937 is a prime.

155001 is a lucky number.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (155003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2511 + ... + 2571.

2¹⁵⁵⁰⁰¹ is an apocalyptic number.

155001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

155001 is a deficient number, since it is larger than the sum of its proper divisors (108871).

155001 is a wasteful number, since it uses less digits than its factorization.

155001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93 (or 82 counting only the distinct ones).

The product of its (nonzero) digits is 25, while the sum is 12.

The square root of 155001 is about 393.7016636998. The cubic root of 155001 is about 53.7169690693.

Adding to 155001 its reverse (100551), we get a palindrome (255552).

The spelling of 155001 in words is "one hundred fifty-five thousand, one".