51713181 has 16 divisors (see below), whose sum is σ = 82505920. Its totient is φ = 31823280.

The previous prime is 51713173. The next prime is 51713209. The reversal of 51713181 is 18131715.

It is not a de Polignac number, because 51713181 - 2³ = 51713173 is a prime.

It is a super-2 number, since 2×51713181² = 5348506178277522, which contains 22 as substring.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51713141) 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, 73315 + ... + 74016.

It is an arithmetic number, because the mean of its divisors is an integer number (5156620).

Almost surely, 2^51713181 is an apocalyptic number.

It is an amenable number.

51713181 is a deficient number, since it is larger than the sum of its proper divisors (30792739).

51713181 is a wasteful number, since it uses less digits than its factorization.

51713181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147353 (or 147347 counting only the distinct ones).

The product of its digits is 840, while the sum is 27.

The square root of 51713181 is about 7191.1877322178. The cubic root of 51713181 is about 372.5635967868.

Adding to 51713181 its reverse (18131715), we get a palindrome (69844896).

The spelling of 51713181 in words is "fifty-one million, seven hundred thirteen thousand, one hundred eighty-one".