649949731 has 2 divisors, whose sum is σ = 649949732. Its totient is φ = 649949730.

The previous prime is 649949681. The next prime is 649949749. The reversal of 649949731 is 137949946.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 649949731 - 2⁷ = 649949603 is a prime.

It is a super-2 number, since 2×649949731² = 844869305653944722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (649949231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324974865 + 324974866.

It is an arithmetic number, because the mean of its divisors is an integer number (324974866).

Almost surely, 2^649949731 is an apocalyptic number.

649949731 is a deficient number, since it is larger than the sum of its proper divisors (1).

649949731 is an equidigital number, since it uses as much as digits as its factorization.

649949731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1469664, while the sum is 52.

The square root of 649949731 is about 25494.1116927027. Note that the first 3 decimals coincide. The cubic root of 649949731 is about 866.2167740095.

The spelling of 649949731 in words is "six hundred forty-nine million, nine hundred forty-nine thousand, seven hundred thirty-one".