649730957 has 2 divisors, whose sum is σ = 649730958. Its totient is φ = 649730956.

The previous prime is 649730911. The next prime is 649730969. The reversal of 649730957 is 759037946.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 574752676 + 74978281 = 23974^2 + 8659^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-649730957 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (649730057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324865478 + 324865479.

It is an arithmetic number, because the mean of its divisors is an integer number (324865479).

Almost surely, 2^649730957 is an apocalyptic number.

It is an amenable number.

649730957 is a deficient number, since it is larger than the sum of its proper divisors (1).

649730957 is an equidigital number, since it uses as much as digits as its factorization.

649730957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1428840, while the sum is 50.

The square root of 649730957 is about 25489.8206545280. The cubic root of 649730957 is about 866.1195731717.

The spelling of 649730957 in words is "six hundred forty-nine million, seven hundred thirty thousand, nine hundred fifty-seven".