51118139 has 2 divisors, whose sum is σ = 51118140. Its totient is φ = 51118138.

The previous prime is 51118091. The next prime is 51118147. The reversal of 51118139 is 93181115.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51118139 - 2⁸ = 51117883 is a prime.

It is a super-2 number, since 2×51118139² = 5226128269646642, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51118159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25559069 + 25559070.

It is an arithmetic number, because the mean of its divisors is an integer number (25559070).

Almost surely, 2^51118139 is an apocalyptic number.

51118139 is a deficient number, since it is larger than the sum of its proper divisors (1).

51118139 is an equidigital number, since it uses as much as digits as its factorization.

51118139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1080, while the sum is 29.

The square root of 51118139 is about 7149.6950284610. The cubic root of 51118139 is about 371.1291026340.

The spelling of 51118139 in words is "fifty-one million, one hundred eighteen thousand, one hundred thirty-nine".