956965981 has 4 divisors (see below), whose sum is σ = 957131964. Its totient is φ = 956800000.

The previous prime is 956965967. The next prime is 956965993. The reversal of 956965981 is 189569659.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 554602500 + 402363481 = 23550^2 + 20059^2 .

It is a cyclic number.

It is not a de Polignac number, because 956965981 - 2¹⁷ = 956834909 is a prime.

It is a super-2 number, since 2×956965981² = 1831567777582584722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (956965931) 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 3 ways as a sum of consecutive naturals, for example, 74020 + ... + 85981.

It is an arithmetic number, because the mean of its divisors is an integer number (239282991).

Almost surely, 2^956965981 is an apocalyptic number.

It is an amenable number.

956965981 is a deficient number, since it is larger than the sum of its proper divisors (165983).

956965981 is a wasteful number, since it uses less digits than its factorization.

956965981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165982.

The product of its digits is 5248800, while the sum is 58.

The square root of 956965981 is about 30934.8667525819. The cubic root of 956965981 is about 985.4444921138. Note that the first 4 decimals are identical.

It can be divided in two parts, 95696 and 5981, that multiplied together give a square (572357776 = 23924²).

The spelling of 956965981 in words is "nine hundred fifty-six million, nine hundred sixty-five thousand, nine hundred eighty-one".