51731271 has 16 divisors (see below), whose sum is σ = 76753920. Its totient is φ = 34435800.

The previous prime is 51731263. The next prime is 51731293. The reversal of 51731271 is 17213715.

It is a happy number.

It is not a de Polignac number, because 51731271 - 2³ = 51731263 is a prime.

It is a super-2 number, since 2×51731271² = 5352248798550882, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51731261) 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, 27466 + ... + 29288.

It is an arithmetic number, because the mean of its divisors is an integer number (4797120).

Almost surely, 2^51731271 is an apocalyptic number.

51731271 is a deficient number, since it is larger than the sum of its proper divisors (25022649).

51731271 is a wasteful number, since it uses less digits than its factorization.

51731271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2883 (or 2877 counting only the distinct ones).

The product of its digits is 1470, while the sum is 27.

The square root of 51731271 is about 7192.4454116802. The cubic root of 51731271 is about 372.6070343889.

Adding to 51731271 its reverse (17213715), we get a palindrome (68944986).

The spelling of 51731271 in words is "fifty-one million, seven hundred thirty-one thousand, two hundred seventy-one".