51513719 has 2 divisors, whose sum is σ = 51513720. Its totient is φ = 51513718.

The previous prime is 51513703. The next prime is 51513743. The reversal of 51513719 is 91731515.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51513719 - 2⁴ = 51513703 is a prime.

It is a super-2 number, since 2×51513719² = 5307326490421922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51513619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25756859 + 25756860.

It is an arithmetic number, because the mean of its divisors is an integer number (25756860).

Almost surely, 2^51513719 is an apocalyptic number.

51513719 is a deficient number, since it is larger than the sum of its proper divisors (1).

51513719 is an equidigital number, since it uses as much as digits as its factorization.

51513719 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4725, while the sum is 32.

The square root of 51513719 is about 7177.3058315778. The cubic root of 51513719 is about 372.0839767826.

The spelling of 51513719 in words is "fifty-one million, five hundred thirteen thousand, seven hundred nineteen".