649790569 has 2 divisors, whose sum is σ = 649790570. Its totient is φ = 649790568.

The previous prime is 649790527. The next prime is 649790579. The reversal of 649790569 is 965097946.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 615684969 + 34105600 = 24813^2 + 5840^2 .

It is a cyclic number.

It is not a de Polignac number, because 649790569 - 2¹³ = 649782377 is a prime.

It is a super-2 number, since 2×649790569² = 844455567122687522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (649790579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324895284 + 324895285.

It is an arithmetic number, because the mean of its divisors is an integer number (324895285).

Almost surely, 2^649790569 is an apocalyptic number.

It is an amenable number.

649790569 is a deficient number, since it is larger than the sum of its proper divisors (1).

649790569 is an equidigital number, since it uses as much as digits as its factorization.

649790569 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3674160, while the sum is 55.

The square root of 649790569 is about 25490.9899572378. The cubic root of 649790569 is about 866.1460608230.

The spelling of 649790569 in words is "six hundred forty-nine million, seven hundred ninety thousand, five hundred sixty-nine".