51312933 has 20 divisors (see below), whose sum is σ = 87604000. Its totient is φ = 29321352.

The previous prime is 51312929. The next prime is 51312959. The reversal of 51312933 is 33921315.

It is a happy number.

It is not a de Polignac number, because 51312933 - 2² = 51312929 is a prime.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51312897 and 51312906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51312913) 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, 44683 + ... + 45816.

It is an arithmetic number, because the mean of its divisors is an integer number (4380200).

Almost surely, 2^51312933 is an apocalyptic number.

It is an amenable number.

51312933 is a deficient number, since it is larger than the sum of its proper divisors (36291067).

51312933 is an equidigital number, since it uses as much as digits as its factorization.

51312933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90518 (or 90509 counting only the distinct ones).

The product of its digits is 2430, while the sum is 27.

The square root of 51312933 is about 7163.3046144918. The cubic root of 51312933 is about 371.5999210736.

The spelling of 51312933 in words is "fifty-one million, three hundred twelve thousand, nine hundred thirty-three".