155091257 has 16 divisors (see below), whose sum is σ = 160745472. Its totient is φ = 149587200.

The previous prime is 155091241. The next prime is 155091301. The reversal of 155091257 is 752190551.

It is a cyclic number.

It is not a de Polignac number, because 155091257 - 2⁴ = 155091241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155091757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1221128 + ... + 1221254.

It is an arithmetic number, because the mean of its divisors is an integer number (10046592).

Almost surely, 2^155091257 is an apocalyptic number.

It is an amenable number.

155091257 is a deficient number, since it is larger than the sum of its proper divisors (5654215).

155091257 is a wasteful number, since it uses less digits than its factorization.

155091257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448.

The product of its (nonzero) digits is 15750, while the sum is 35.

The square root of 155091257 is about 12453.5640280203. The cubic root of 155091257 is about 537.2739350039.

The spelling of 155091257 in words is "one hundred fifty-five million, ninety-one thousand, two hundred fifty-seven".