649878967 has 2 divisors, whose sum is σ = 649878968. Its totient is φ = 649878966.

The previous prime is 649878953. The next prime is 649879003. The reversal of 649878967 is 769878946.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-649878967 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 649878899 and 649878908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (649878937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324939483 + 324939484.

It is an arithmetic number, because the mean of its divisors is an integer number (324939484).

Almost surely, 2^649878967 is an apocalyptic number.

649878967 is a deficient number, since it is larger than the sum of its proper divisors (1).

649878967 is an equidigital number, since it uses as much as digits as its factorization.

649878967 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36578304, while the sum is 64.

The square root of 649878967 is about 25492.7238050390. The cubic root of 649878967 is about 866.1853360969.

The spelling of 649878967 in words is "six hundred forty-nine million, eight hundred seventy-eight thousand, nine hundred sixty-seven".