51558813 has 12 divisors (see below), whose sum is σ = 75198240. Its totient is φ = 34038216.

The previous prime is 51558811. The next prime is 51558833. The reversal of 51558813 is 31885515.

It is not a de Polignac number, because 51558813 - 2¹ = 51558811 is a prime.

It is a super-2 number, since 2×51558813² = 5316622395937938, which contains 22 as substring.

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 congruent number.

It is not an unprimeable number, because it can be changed into a prime (51558811) 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, 26883 + ... + 28736.

It is an arithmetic number, because the mean of its divisors is an integer number (6266520).

Almost surely, 2^51558813 is an apocalyptic number.

It is an amenable number.

51558813 is a deficient number, since it is larger than the sum of its proper divisors (23639427).

51558813 is a wasteful number, since it uses less digits than its factorization.

51558813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55728 (or 55725 counting only the distinct ones).

The product of its digits is 24000, while the sum is 36.

The square root of 51558813 is about 7180.4465738560. The cubic root of 51558813 is about 372.1925165505.

The spelling of 51558813 in words is "fifty-one million, five hundred fifty-eight thousand, eight hundred thirteen".