51900391 has 2 divisors, whose sum is σ = 51900392. Its totient is φ = 51900390.

The previous prime is 51900377. The next prime is 51900403. The reversal of 51900391 is 19300915.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51900391 - 2⁷ = 51900263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51900791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25950195 + 25950196.

It is an arithmetic number, because the mean of its divisors is an integer number (25950196).

Almost surely, 2^51900391 is an apocalyptic number.

51900391 is a deficient number, since it is larger than the sum of its proper divisors (1).

51900391 is an equidigital number, since it uses as much as digits as its factorization.

51900391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1215, while the sum is 28.

The square root of 51900391 is about 7204.1925987580. The cubic root of 51900391 is about 373.0126353273.

The spelling of 51900391 in words is "fifty-one million, nine hundred thousand, three hundred ninety-one".