649561537 has 2 divisors, whose sum is σ = 649561538. Its totient is φ = 649561536.

The previous prime is 649561513. The next prime is 649561541. The reversal of 649561537 is 735165946.

649561537 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 564110001 + 85451536 = 23751^2 + 9244^2 .

It is a cyclic number.

It is not a de Polignac number, because 649561537 - 2¹¹ = 649559489 is a prime.

It is not a weakly prime, because it can be changed into another prime (649561337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324780768 + 324780769.

It is an arithmetic number, because the mean of its divisors is an integer number (324780769).

Almost surely, 2^649561537 is an apocalyptic number.

It is an amenable number.

649561537 is a deficient number, since it is larger than the sum of its proper divisors (1).

649561537 is an equidigital number, since it uses as much as digits as its factorization.

649561537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 680400, while the sum is 46.

The square root of 649561537 is about 25486.4971504520. The cubic root of 649561537 is about 866.0442852224.

The spelling of 649561537 in words is "six hundred forty-nine million, five hundred sixty-one thousand, five hundred thirty-seven".