51899905 has 16 divisors (see below), whose sum is σ = 63383040. Its totient is φ = 40791168.

The previous prime is 51899893. The next prime is 51899917. The reversal of 51899905 is 50999815.

51899905 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (51899893) and next prime (51899917).

It is a cyclic number.

It is not a de Polignac number, because 51899905 - 2¹⁷ = 51768833 is a prime.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 98974 + ... + 99496.

It is an arithmetic number, because the mean of its divisors is an integer number (3961440).

Almost surely, 2^51899905 is an apocalyptic number.

It is an amenable number.

51899905 is a deficient number, since it is larger than the sum of its proper divisors (11483135).

51899905 is a wasteful number, since it uses less digits than its factorization.

51899905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 840.

The product of its (nonzero) digits is 145800, while the sum is 46.

The square root of 51899905 is about 7204.1588683204. The cubic root of 51899905 is about 373.0114710155.

The spelling of 51899905 in words is "fifty-one million, eight hundred ninety-nine thousand, nine hundred five".