155957 has 4 divisors (see below), whose sum is σ = 157920. Its totient is φ = 153996.

The previous prime is 155921. The next prime is 156007. The reversal of 155957 is 759551.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 759551 = 13 ⋅58427.

It is a cyclic number.

It is not a de Polignac number, because 155957 - 2⁶ = 155893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155557) 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, 857 + ... + 1022.

It is an arithmetic number, because the mean of its divisors is an integer number (39480).

2¹⁵⁵⁹⁵⁷ is an apocalyptic number.

It is an amenable number.

155957 is a deficient number, since it is larger than the sum of its proper divisors (1963).

155957 is an equidigital number, since it uses as much as digits as its factorization.

155957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1962.

The product of its digits is 7875, while the sum is 32.

The square root of 155957 is about 394.9139146700. The cubic root of 155957 is about 53.8271795522.

The spelling of 155957 in words is "one hundred fifty-five thousand, nine hundred fifty-seven".