649697539 has 2 divisors, whose sum is σ = 649697540. Its totient is φ = 649697538.

The previous prime is 649697507. The next prime is 649697567. The reversal of 649697539 is 935796946.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 649697539 - 2⁵ = 649697507 is a prime.

It is not a weakly prime, because it can be changed into another prime (649697239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324848769 + 324848770.

It is an arithmetic number, because the mean of its divisors is an integer number (324848770).

Almost surely, 2^649697539 is an apocalyptic number.

649697539 is a deficient number, since it is larger than the sum of its proper divisors (1).

649697539 is an equidigital number, since it uses as much as digits as its factorization.

649697539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11022480, while the sum is 58.

The square root of 649697539 is about 25489.1651295212. The cubic root of 649697539 is about 866.1047237022.

The spelling of 649697539 in words is "six hundred forty-nine million, six hundred ninety-seven thousand, five hundred thirty-nine".