51188231 has 4 divisors (see below), whose sum is σ = 51909264. Its totient is φ = 50467200.

The previous prime is 51188197. The next prime is 51188233. The reversal of 51188231 is 13288115.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51188231 - 2⁶ = 51188167 is a prime.

It is a super-2 number, since 2×51188231² = 5240469985818722, 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 = 51188194 and 51188203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51188233) 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, 360410 + ... + 360551.

It is an arithmetic number, because the mean of its divisors is an integer number (12977316).

Almost surely, 2^51188231 is an apocalyptic number.

51188231 is a deficient number, since it is larger than the sum of its proper divisors (721033).

51188231 is an equidigital number, since it uses as much as digits as its factorization.

51188231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721032.

The product of its digits is 1920, while the sum is 29.

The square root of 51188231 is about 7154.5950968591. The cubic root of 51188231 is about 371.2986530197.

The spelling of 51188231 in words is "fifty-one million, one hundred eighty-eight thousand, two hundred thirty-one".