956989643 has 2 divisors, whose sum is σ = 956989644. Its totient is φ = 956989642.

The previous prime is 956989637. The next prime is 956989667. The reversal of 956989643 is 346989659.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 956989643 - 2⁸ = 956989387 is a prime.

It is not a weakly prime, because it can be changed into another prime (956989603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 478494821 + 478494822.

It is an arithmetic number, because the mean of its divisors is an integer number (478494822).

Almost surely, 2^956989643 is an apocalyptic number.

956989643 is a deficient number, since it is larger than the sum of its proper divisors (1).

956989643 is an equidigital number, since it uses as much as digits as its factorization.

956989643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12597120, while the sum is 59.

The square root of 956989643 is about 30935.2491989316. The cubic root of 956989643 is about 985.4526141006.

The spelling of 956989643 in words is "nine hundred fifty-six million, nine hundred eighty-nine thousand, six hundred forty-three".