51711381 has 12 divisors (see below), whose sum is σ = 74800908. Its totient is φ = 34425024.

The previous prime is 51711367. The next prime is 51711391. The reversal of 51711381 is 18311715.

It can be written as a sum of positive squares in 2 ways, for example, as 3186225 + 48525156 = 1785^2 + 6966^2 .

It is not a de Polignac number, because 51711381 - 2⁵ = 51711349 is a prime.

It is a super-2 number, since 2×51711381² = 5348133849854322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51711391) 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, 3241 + ... + 10673.

It is an arithmetic number, because the mean of its divisors is an integer number (6233409).

Almost surely, 2^51711381 is an apocalyptic number.

It is an amenable number.

51711381 is a deficient number, since it is larger than the sum of its proper divisors (23089527).

51711381 is a wasteful number, since it uses less digits than its factorization.

51711381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8212 (or 8209 counting only the distinct ones).

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

The square root of 51711381 is about 7191.0625779505. The cubic root of 51711381 is about 372.5592740833.

The spelling of 51711381 in words is "fifty-one million, seven hundred eleven thousand, three hundred eighty-one".