51313493 has 16 divisors (see below), whose sum is σ = 64157184. Its totient is φ = 39870960.

The previous prime is 51313481. The next prime is 51313501. The reversal of 51313493 is 39431315.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51313493 is a prime.

It is a super-2 number, since 2×51313493² = 5266149127722098, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51313403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35246 + ... + 36672.

It is an arithmetic number, because the mean of its divisors is an integer number (4009824).

Almost surely, 2^51313493 is an apocalyptic number.

It is an amenable number.

51313493 is a deficient number, since it is larger than the sum of its proper divisors (12843691).

51313493 is a wasteful number, since it uses less digits than its factorization.

51313493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1912.

The product of its digits is 4860, while the sum is 29.

The square root of 51313493 is about 7163.3437024898. The cubic root of 51313493 is about 371.6012728784.

The spelling of 51313493 in words is "fifty-one million, three hundred thirteen thousand, four hundred ninety-three".