51891113 has 2 divisors, whose sum is σ = 51891114. Its totient is φ = 51891112.

The previous prime is 51891083. The next prime is 51891137. The reversal of 51891113 is 31119815.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51652969 + 238144 = 7187^2 + 488^2 .

It is a cyclic number.

It is not a de Polignac number, because 51891113 - 2⁸ = 51890857 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (51891173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25945556 + 25945557.

It is an arithmetic number, because the mean of its divisors is an integer number (25945557).

Almost surely, 2^51891113 is an apocalyptic number.

It is an amenable number.

51891113 is a deficient number, since it is larger than the sum of its proper divisors (1).

51891113 is an equidigital number, since it uses as much as digits as its factorization.

51891113 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 51891113 is about 7203.5486393860. The cubic root of 51891113 is about 372.9904067377.

The spelling of 51891113 in words is "fifty-one million, eight hundred ninety-one thousand, one hundred thirteen".