51401999 has 16 divisors (see below), whose sum is σ = 61295616. Its totient is φ = 42556800.

The previous prime is 51401993. The next prime is 51402017. The reversal of 51401999 is 99910415.

It is not a de Polignac number, because 51401999 - 2⁸ = 51401743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51401993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1364 + ... + 10230.

It is an arithmetic number, because the mean of its divisors is an integer number (3830976).

Almost surely, 2^51401999 is an apocalyptic number.

51401999 is a deficient number, since it is larger than the sum of its proper divisors (9893617).

51401999 is a wasteful number, since it uses less digits than its factorization.

51401999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8926.

The product of its (nonzero) digits is 14580, while the sum is 38.

The square root of 51401999 is about 7169.5187425656. The cubic root of 51401999 is about 371.8147972972.

The spelling of 51401999 in words is "fifty-one million, four hundred one thousand, nine hundred ninety-nine".