331157 has 6 divisors (see below), whose sum is σ = 341154. Its totient is φ = 321440.

The previous prime is 331153. The next prime is 331159. The reversal of 331157 is 751133.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 7396 + 323761 = 86^2 + 569^2 .

It is not a de Polignac number, because 331157 - 2² = 331153 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 331157.

It is not an unprimeable number, because it can be changed into a prime (331153) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1583 + ... + 1779.

It is an arithmetic number, because the mean of its divisors is an integer number (56859).

2³³¹¹⁵⁷ is an apocalyptic number.

It is an amenable number.

331157 is a deficient number, since it is larger than the sum of its proper divisors (9997).

331157 is an equidigital number, since it uses as much as digits as its factorization.

331157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279 (or 238 counting only the distinct ones).

The product of its digits is 315, while the sum is 20.

The square root of 331157 is about 575.4624227523. The cubic root of 331157 is about 69.1848993078.

The spelling of 331157 in words is "three hundred thirty-one thousand, one hundred fifty-seven".