981957 has 4 divisors (see below), whose sum is σ = 1309280. Its totient is φ = 654636.

The previous prime is 981949. The next prime is 981961. The reversal of 981957 is 759189.

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, and also an emirpimes, since its reverse is a distinct semiprime: 759189 = 3 ⋅253063.

It is not a de Polignac number, because 981957 - 2³ = 981949 is a prime.

It is a D-number.

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 981957.

It is not an unprimeable number, because it can be changed into a prime (981947) 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, 163657 + ... + 163662.

It is an arithmetic number, because the mean of its divisors is an integer number (327320).

2⁹⁸¹⁹⁵⁷ is an apocalyptic number.

It is an amenable number.

981957 is a deficient number, since it is larger than the sum of its proper divisors (327323).

981957 is a wasteful number, since it uses less digits than its factorization.

981957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327322.

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

The square root of 981957 is about 990.9374349574. The cubic root of 981957 is about 99.3949127455.

The spelling of 981957 in words is "nine hundred eighty-one thousand, nine hundred fifty-seven".