649159597 has 2 divisors, whose sum is σ = 649159598. Its totient is φ = 649159596.

The previous prime is 649159573. The next prime is 649159631. The reversal of 649159597 is 795951946.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 441252036 + 207907561 = 21006^2 + 14419^2 .

It is a cyclic number.

It is not a de Polignac number, because 649159597 - 2²³ = 640770989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (649159897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324579798 + 324579799.

It is an arithmetic number, because the mean of its divisors is an integer number (324579799).

Almost surely, 2^649159597 is an apocalyptic number.

It is an amenable number.

649159597 is a deficient number, since it is larger than the sum of its proper divisors (1).

649159597 is an equidigital number, since it uses as much as digits as its factorization.

649159597 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3061800, while the sum is 55.

The square root of 649159597 is about 25478.6105782870. The cubic root of 649159597 is about 865.8656161540.

The spelling of 649159597 in words is "six hundred forty-nine million, one hundred fifty-nine thousand, five hundred ninety-seven".