155345331 has 4 divisors (see below), whose sum is σ = 207127112. Its totient is φ = 103563552.

The previous prime is 155345291. The next prime is 155345341. The reversal of 155345331 is 133543551.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 155345331 - 2²⁵ = 121790899 is a prime.

It is a super-2 number, since 2×155345331² = 48264343726999122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155345341) 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, 25890886 + ... + 25890891.

It is an arithmetic number, because the mean of its divisors is an integer number (51781778).

Almost surely, 2^155345331 is an apocalyptic number.

155345331 is a deficient number, since it is larger than the sum of its proper divisors (51781781).

155345331 is an equidigital number, since it uses as much as digits as its factorization.

155345331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51781780.

The product of its digits is 13500, while the sum is 30.

The square root of 155345331 is about 12463.7607085502. The cubic root of 155345331 is about 537.5671663676.

Adding to 155345331 its reverse (133543551), we get a palindrome (288888882).

The spelling of 155345331 in words is "one hundred fifty-five million, three hundred forty-five thousand, three hundred thirty-one".