51398719 has 2 divisors, whose sum is σ = 51398720. Its totient is φ = 51398718.

The previous prime is 51398689. The next prime is 51398723. The reversal of 51398719 is 91789315.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51398719 - 2⁵ = 51398687 is a prime.

It is a super-2 number, since 2×51398719² = 5283656629681922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51398729) 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 as a sum of consecutive naturals, namely, 25699359 + 25699360.

It is an arithmetic number, because the mean of its divisors is an integer number (25699360).

Almost surely, 2^51398719 is an apocalyptic number.

51398719 is a deficient number, since it is larger than the sum of its proper divisors (1).

51398719 is an equidigital number, since it uses as much as digits as its factorization.

51398719 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 43.

The square root of 51398719 is about 7169.2899927399. The cubic root of 51398719 is about 371.8068885355.

The spelling of 51398719 in words is "fifty-one million, three hundred ninety-eight thousand, seven hundred nineteen".