957981 has 4 divisors (see below), whose sum is σ = 1277312. Its totient is φ = 638652.

The previous prime is 957977. The next prime is 957991. The reversal of 957981 is 189759.

It is a happy number.

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.

It is not a de Polignac number, because 957981 - 2² = 957977 is a prime.

It is a super-2 number, since 2×957981² = 1835455192722, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

957981 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (957991) 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, 159661 + ... + 159666.

It is an arithmetic number, because the mean of its divisors is an integer number (319328).

2⁹⁵⁷⁹⁸¹ is an apocalyptic number.

It is an amenable number.

957981 is a deficient number, since it is larger than the sum of its proper divisors (319331).

957981 is a wasteful number, since it uses less digits than its factorization.

957981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319330.

The product of its digits is 22680, while the sum is 39.

The square root of 957981 is about 978.7650381986. The cubic root of 957981 is about 98.5792777378.

The spelling of 957981 in words is "nine hundred fifty-seven thousand, nine hundred eighty-one".