51731227 has 4 divisors (see below), whose sum is σ = 51745936. Its totient is φ = 51716520.

The previous prime is 51731203. The next prime is 51731237. The reversal of 51731227 is 72213715.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51731227 is a prime.

It is a super-2 number, since 2×51731227² = 5352239693851058, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51731195 and 51731204.

It is not an unprimeable number, because it can be changed into a prime (51731237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1378 + ... + 10264.

It is an arithmetic number, because the mean of its divisors is an integer number (12936484).

Almost surely, 2^51731227 is an apocalyptic number.

51731227 is a deficient number, since it is larger than the sum of its proper divisors (14709).

51731227 is an equidigital number, since it uses as much as digits as its factorization.

51731227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14708.

The product of its digits is 2940, while the sum is 28.

The square root of 51731227 is about 7192.4423529146. The cubic root of 51731227 is about 372.6069287487.

It can be divided in two parts, 5173 and 1227, that added together give a square (6400 = 80²).

The spelling of 51731227 in words is "fifty-one million, seven hundred thirty-one thousand, two hundred twenty-seven".