51425987 has 2 divisors, whose sum is σ = 51425988. Its totient is φ = 51425986.

The previous prime is 51425929. The next prime is 51426017. The reversal of 51425987 is 78952415.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51425987 - 2⁶ = 51425923 is a prime.

It is not a weakly prime, because it can be changed into another prime (51425687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25712993 + 25712994.

It is an arithmetic number, because the mean of its divisors is an integer number (25712994).

Almost surely, 2^51425987 is an apocalyptic number.

51425987 is a deficient number, since it is larger than the sum of its proper divisors (1).

51425987 is an equidigital number, since it uses as much as digits as its factorization.

51425987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 100800, while the sum is 41.

The square root of 51425987 is about 7171.1914630694. The cubic root of 51425987 is about 371.8726271251.

The spelling of 51425987 in words is "fifty-one million, four hundred twenty-five thousand, nine hundred eighty-seven".