51513993 has 12 divisors (see below), whose sum is σ = 74496708. Its totient is φ = 34302240.

The previous prime is 51513977. The next prime is 51514013. The reversal of 51513993 is 39931515.

51513993 is a `hidden beast` number, since 51 + 513 + 9 + 93 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 35856144 + 15657849 = 5988^2 + 3957^2 .

It is not a de Polignac number, because 51513993 - 2⁴ = 51513977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51513923) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6103 + ... + 11843.

It is an arithmetic number, because the mean of its divisors is an integer number (6208059).

Almost surely, 2^51513993 is an apocalyptic number.

It is an amenable number.

51513993 is a deficient number, since it is larger than the sum of its proper divisors (22982715).

51513993 is a wasteful number, since it uses less digits than its factorization.

51513993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6744 (or 6741 counting only the distinct ones).

The product of its digits is 18225, while the sum is 36.

The square root of 51513993 is about 7177.3249194947. The cubic root of 51513993 is about 372.0846364828.

The spelling of 51513993 in words is "fifty-one million, five hundred thirteen thousand, nine hundred ninety-three".