51361731 has 24 divisors (see below), whose sum is σ = 79277120. Its totient is φ = 31947696.

The previous prime is 51361703. The next prime is 51361747. The reversal of 51361731 is 13716315.

51361731 is a `hidden beast` number, since 5 + 13 + 617 + 31 = 666.

51361731 is nontrivially palindromic in base 2.

It is not a de Polignac number, because 51361731 - 2¹¹ = 51359683 is a prime.

It is a super-2 number, since 2×51361731² = 5276054822632722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51361695 and 51361704.

It is not an unprimeable number, because it can be changed into a prime (51361031) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9216 + ... + 13698.

Almost surely, 2^51361731 is an apocalyptic number.

51361731 is a deficient number, since it is larger than the sum of its proper divisors (27915389).

51361731 is a wasteful number, since it uses less digits than its factorization.

51361731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4575 (or 4572 counting only the distinct ones).

The product of its digits is 1890, while the sum is 27.

The square root of 51361731 is about 7166.7099145982. The cubic root of 51361731 is about 371.7176794809.

The spelling of 51361731 in words is "fifty-one million, three hundred sixty-one thousand, seven hundred thirty-one".