51540651 has 16 divisors (see below), whose sum is σ = 80848800. Its totient is φ = 32338944.

The previous prime is 51540647. The next prime is 51540653. The reversal of 51540651 is 15604515.

It is a happy number.

51540651 is a `hidden beast` number, since 5 + 1 + 5 + 4 + 0 + 651 = 666.

51540651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51540651 - 2² = 51540647 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (51540653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55686 + ... + 56603.

It is an arithmetic number, because the mean of its divisors is an integer number (5053050).

Almost surely, 2^51540651 is an apocalyptic number.

51540651 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

51540651 is a deficient number, since it is larger than the sum of its proper divisors (29308149).

51540651 is a wasteful number, since it uses less digits than its factorization.

51540651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112315 (or 112309 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The square root of 51540651 is about 7179.1817778908. The cubic root of 51540651 is about 372.1488088313.

The spelling of 51540651 in words is "fifty-one million, five hundred forty thousand, six hundred fifty-one".