956564509 has 2 divisors, whose sum is σ = 956564510. Its totient is φ = 956564508.

The previous prime is 956564473. The next prime is 956564527. The reversal of 956564509 is 905465659.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 879300409 + 77264100 = 29653^2 + 8790^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-956564509 is a prime.

It is a super-2 number, since 2×956564509² = 1830031319756822162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (956564569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 478282254 + 478282255.

It is an arithmetic number, because the mean of its divisors is an integer number (478282255).

Almost surely, 2^956564509 is an apocalyptic number.

It is an amenable number.

956564509 is a deficient number, since it is larger than the sum of its proper divisors (1).

956564509 is an equidigital number, since it uses as much as digits as its factorization.

956564509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458000, while the sum is 49.

The square root of 956564509 is about 30928.3770831901. The cubic root of 956564509 is about 985.3066663473.

The spelling of 956564509 in words is "nine hundred fifty-six million, five hundred sixty-four thousand, five hundred nine".