51390807 has 8 divisors (see below), whose sum is σ = 73791984. Its totient is φ = 31625088.

The previous prime is 51390793. The next prime is 51390811. The reversal of 51390807 is 70809315.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51390807 - 2⁴ = 51390791 is a prime.

It is a super-2 number, since 2×51390807² = 5282030088222498, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51390827) 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 7 ways as a sum of consecutive naturals, for example, 658818 + ... + 658895.

It is an arithmetic number, because the mean of its divisors is an integer number (9223998).

Almost surely, 2^51390807 is an apocalyptic number.

51390807 is a deficient number, since it is larger than the sum of its proper divisors (22401177).

51390807 is a wasteful number, since it uses less digits than its factorization.

51390807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1317729.

The product of its (nonzero) digits is 7560, while the sum is 33.

The square root of 51390807 is about 7168.7381734863. The cubic root of 51390807 is about 371.7878096744.

The spelling of 51390807 in words is "fifty-one million, three hundred ninety thousand, eight hundred seven".