51813399 has 32 divisors (see below), whose sum is σ = 84015360. Its totient is φ = 27993600.

The previous prime is 51813379. The next prime is 51813407. The reversal of 51813399 is 99331815.

51813399 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51813399 - 2⁷ = 51813271 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51813379) 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 in 31 ways as a sum of consecutive naturals, for example, 8229 + ... + 13089.

It is an arithmetic number, because the mean of its divisors is an integer number (2625480).

Almost surely, 2^51813399 is an apocalyptic number.

51813399 is a deficient number, since it is larger than the sum of its proper divisors (32201961).

51813399 is a wasteful number, since it uses less digits than its factorization.

51813399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4911.

The product of its digits is 29160, while the sum is 39.

The square root of 51813399 is about 7198.1524712943. The cubic root of 51813399 is about 372.8041124168.

It can be divided in two parts, 51 and 813399, that added together give a triangular number (813450 = T₁₂₇₅).

The spelling of 51813399 in words is "fifty-one million, eight hundred thirteen thousand, three hundred ninety-nine".