649970569 has 2 divisors, whose sum is σ = 649970570. Its totient is φ = 649970568.

The previous prime is 649970561. The next prime is 649970599. The reversal of 649970569 is 965079946.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 391564944 + 258405625 = 19788^2 + 16075^2 .

It is a cyclic number.

It is not a de Polignac number, because 649970569 - 2³ = 649970561 is a prime.

It is a super-2 number, since 2×649970569² = 844923481132367522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (649970561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324985284 + 324985285.

It is an arithmetic number, because the mean of its divisors is an integer number (324985285).

Almost surely, 2^649970569 is an apocalyptic number.

It is an amenable number.

649970569 is a deficient number, since it is larger than the sum of its proper divisors (1).

649970569 is an equidigital number, since it uses as much as digits as its factorization.

649970569 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 649970569 is about 25494.5203720329. The cubic root of 649970569 is about 866.2260311522.

The spelling of 649970569 in words is "six hundred forty-nine million, nine hundred seventy thousand, five hundred sixty-nine".