51108931 has 2 divisors, whose sum is σ = 51108932. Its totient is φ = 51108930.

The previous prime is 51108913. The next prime is 51108943. The reversal of 51108931 is 13980115.

51108931 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (51108913) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51108931 - 2⁵ = 51108899 is a prime.

It is a super-2 number, since 2×51108931² = 5224245655925522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51108931.

It is not a weakly prime, because it can be changed into another prime (51108961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25554465 + 25554466.

It is an arithmetic number, because the mean of its divisors is an integer number (25554466).

Almost surely, 2^51108931 is an apocalyptic number.

51108931 is a deficient number, since it is larger than the sum of its proper divisors (1).

51108931 is an equidigital number, since it uses as much as digits as its factorization.

51108931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 28.

The square root of 51108931 is about 7149.0510559094. The cubic root of 51108931 is about 371.1068172505.

It can be divided in two parts, 5110 and 8931, that added together give a palindrome (14041).

The spelling of 51108931 in words is "fifty-one million, one hundred eight thousand, nine hundred thirty-one".