51027999 has 24 divisors (see below), whose sum is σ = 79193520. Its totient is φ = 29103360.

The previous prime is 51027967. The next prime is 51028009. The reversal of 51027999 is 99972015.

It is not a de Polignac number, because 51027999 - 2⁵ = 51027967 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51027999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51027929) 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 23 ways as a sum of consecutive naturals, for example, 2037 + ... + 10305.

It is an arithmetic number, because the mean of its divisors is an integer number (3299730).

Almost surely, 2^51027999 is an apocalyptic number.

51027999 is a deficient number, since it is larger than the sum of its proper divisors (28165521).

51027999 is a wasteful number, since it uses less digits than its factorization.

51027999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8311 (or 8300 counting only the distinct ones).

The product of its (nonzero) digits is 51030, while the sum is 42.

The square root of 51027999 is about 7143.3884816661. The cubic root of 51027999 is about 370.9108287760.

Subtracting 51027999 from its reverse (99972015), we obtain a square (48944016 = 6996²).

The spelling of 51027999 in words is "fifty-one million, twenty-seven thousand, nine hundred ninety-nine".