649210657 has 2 divisors, whose sum is σ = 649210658. Its totient is φ = 649210656.

The previous prime is 649210633. The next prime is 649210691. The reversal of 649210657 is 756012946.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 437479056 + 211731601 = 20916^2 + 14551^2 .

It is a cyclic number.

It is not a de Polignac number, because 649210657 - 2¹⁵ = 649177889 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (649210697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324605328 + 324605329.

It is an arithmetic number, because the mean of its divisors is an integer number (324605329).

Almost surely, 2^649210657 is an apocalyptic number.

It is an amenable number.

649210657 is a deficient number, since it is larger than the sum of its proper divisors (1).

649210657 is an equidigital number, since it uses as much as digits as its factorization.

649210657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 649210657 is about 25479.6125755475. The cubic root of 649210657 is about 865.8883172686. Note that the first 3 decimals are identical.

The spelling of 649210657 in words is "six hundred forty-nine million, two hundred ten thousand, six hundred fifty-seven".