649498879 has 2 divisors, whose sum is σ = 649498880. Its totient is φ = 649498878.

The previous prime is 649498849. The next prime is 649498921. The reversal of 649498879 is 978894946.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 649498879 - 2²³ = 641110271 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 649498879.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (649498849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324749439 + 324749440.

It is an arithmetic number, because the mean of its divisors is an integer number (324749440).

Almost surely, 2^649498879 is an apocalyptic number.

649498879 is a deficient number, since it is larger than the sum of its proper divisors (1).

649498879 is an equidigital number, since it uses as much as digits as its factorization.

649498879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31352832, while the sum is 64.

The square root of 649498879 is about 25485.2678816606. The cubic root of 649498879 is about 866.0164375412.

The spelling of 649498879 in words is "six hundred forty-nine million, four hundred ninety-eight thousand, eight hundred seventy-nine".