51501887 has 2 divisors, whose sum is σ = 51501888. Its totient is φ = 51501886.

The previous prime is 51501869. The next prime is 51501889. The reversal of 51501887 is 78810515.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51501887 - 2¹⁰ = 51500863 is a prime.

Together with 51501889, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51501889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25750943 + 25750944.

It is an arithmetic number, because the mean of its divisors is an integer number (25750944).

Almost surely, 2^51501887 is an apocalyptic number.

51501887 is a deficient number, since it is larger than the sum of its proper divisors (1).

51501887 is an equidigital number, since it uses as much as digits as its factorization.

51501887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11200, while the sum is 35.

The square root of 51501887 is about 7176.4815195192. The cubic root of 51501887 is about 372.0554870599.

The spelling of 51501887 in words is "fifty-one million, five hundred one thousand, eight hundred eighty-seven".