51695887 has 2 divisors, whose sum is σ = 51695888. Its totient is φ = 51695886.

The previous prime is 51695867. The next prime is 51695971. The reversal of 51695887 is 78859615.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51695887 - 2¹¹ = 51693839 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51695887.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51695837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25847943 + 25847944.

It is an arithmetic number, because the mean of its divisors is an integer number (25847944).

Almost surely, 2^51695887 is an apocalyptic number.

51695887 is a deficient number, since it is larger than the sum of its proper divisors (1).

51695887 is an equidigital number, since it uses as much as digits as its factorization.

51695887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 604800, while the sum is 49.

The square root of 51695887 is about 7189.9851877455. The cubic root of 51695887 is about 372.5220610630.

The spelling of 51695887 in words is "fifty-one million, six hundred ninety-five thousand, eight hundred eighty-seven".