649520451 has 20 divisors (see below), whose sum is σ = 977268600. Its totient is φ = 429890976.

The previous prime is 649520447. The next prime is 649520467. The reversal of 649520451 is 154025946.

649520451 is a `hidden beast` number, since 649 + 5 + 2 + 0 + 4 + 5 + 1 = 666.

It is not a de Polignac number, because 649520451 - 2² = 649520447 is a prime.

It is not an unprimeable number, because it can be changed into a prime (649520471) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 17586 + ... + 40103.

It is an arithmetic number, because the mean of its divisors is an integer number (48863430).

Almost surely, 2^649520451 is an apocalyptic number.

649520451 is a deficient number, since it is larger than the sum of its proper divisors (327748149).

649520451 is a wasteful number, since it uses less digits than its factorization.

649520451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57840 (or 57831 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 649520451 is about 25485.6911030484. The cubic root of 649520451 is about 866.0260251892.

The spelling of 649520451 in words is "six hundred forty-nine million, five hundred twenty thousand, four hundred fifty-one".