51065649 has 24 divisors (see below), whose sum is σ = 76923392. Its totient is φ = 32607360.

The previous prime is 51065629. The next prime is 51065653. The reversal of 51065649 is 94656015.

51065649 is a `hidden beast` number, since 5 + 1 + 0 + 6 + 5 + 649 = 666.

It is not a de Polignac number, because 51065649 - 2⁸ = 51065393 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51065629) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27849 + ... + 29625.

Almost surely, 2^51065649 is an apocalyptic number.

It is an amenable number.

51065649 is a deficient number, since it is larger than the sum of its proper divisors (25857743).

51065649 is a wasteful number, since it uses less digits than its factorization.

51065649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1917 (or 1914 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 51065649 is about 7146.0232997101. The cubic root of 51065649 is about 371.0020294230.

The spelling of 51065649 in words is "fifty-one million, sixty-five thousand, six hundred forty-nine".