51713649 has 48 divisors (see below), whose sum is σ = 86806720. Its totient is φ = 29393280.

The previous prime is 51713647. The next prime is 51713653. The reversal of 51713649 is 94631715.

51713649 is a `hidden beast` number, since 5 + 1 + 7 + 1 + 3 + 649 = 666.

It is not a de Polignac number, because 51713649 - 2¹ = 51713647 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51713647) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 95319 + ... + 95859.

Almost surely, 2^51713649 is an apocalyptic number.

It is an amenable number.

51713649 is a deficient number, since it is larger than the sum of its proper divisors (35093071).

51713649 is a wasteful number, since it uses less digits than its factorization.

51713649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622 (or 619 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 51713649 is about 7191.2202719705. The cubic root of 51713649 is about 372.5647206733.

The spelling of 51713649 in words is "fifty-one million, seven hundred thirteen thousand, six hundred forty-nine".