51500087 has 2 divisors, whose sum is σ = 51500088. Its totient is φ = 51500086.

The previous prime is 51500077. The next prime is 51500101. The reversal of 51500087 is 78000515.

51500087 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51500087 - 2⁶ = 51500023 is a prime.

It is a super-2 number, since 2×51500087² = 5304517922015138, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51500077) 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, 25750043 + 25750044.

It is an arithmetic number, because the mean of its divisors is an integer number (25750044).

Almost surely, 2^51500087 is an apocalyptic number.

51500087 is a deficient number, since it is larger than the sum of its proper divisors (1).

51500087 is an equidigital number, since it uses as much as digits as its factorization.

51500087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1400, while the sum is 26.

The square root of 51500087 is about 7176.3561087783. The cubic root of 51500087 is about 372.0511525411.

The spelling of 51500087 in words is "fifty-one million, five hundred thousand, eighty-seven".