51407999 has 2 divisors, whose sum is σ = 51408000. Its totient is φ = 51407998.

The previous prime is 51407971. The next prime is 51408001. The reversal of 51407999 is 99970415.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51407999 is a prime.

It is a super-2 number, since 2×51407999² = 5285564722368002, which contains 22 as substring.

Together with 51408001, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51407929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25703999 + 25704000.

It is an arithmetic number, because the mean of its divisors is an integer number (25704000).

Almost surely, 2^51407999 is an apocalyptic number.

51407999 is a deficient number, since it is larger than the sum of its proper divisors (1).

51407999 is an equidigital number, since it uses as much as digits as its factorization.

51407999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 102060, while the sum is 44.

The square root of 51407999 is about 7169.9371684834. The cubic root of 51407999 is about 371.8292636735.

The spelling of 51407999 in words is "fifty-one million, four hundred seven thousand, nine hundred ninety-nine".