51699887 has 2 divisors, whose sum is σ = 51699888. Its totient is φ = 51699886.

The previous prime is 51699821. The next prime is 51699911. The reversal of 51699887 is 78899615.

51699887 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51699887 - 2²⁰ = 50651311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51699587) 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, 25849943 + 25849944.

It is an arithmetic number, because the mean of its divisors is an integer number (25849944).

Almost surely, 2^51699887 is an apocalyptic number.

51699887 is a deficient number, since it is larger than the sum of its proper divisors (1).

51699887 is an equidigital number, since it uses as much as digits as its factorization.

51699887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1088640, while the sum is 53.

The square root of 51699887 is about 7190.2633470548. The cubic root of 51699887 is about 372.5316688539.

The spelling of 51699887 in words is "fifty-one million, six hundred ninety-nine thousand, eight hundred eighty-seven".