51918739 has 2 divisors, whose sum is σ = 51918740. Its totient is φ = 51918738.

The previous prime is 51918719. The next prime is 51918749. The reversal of 51918739 is 93781915.

51918739 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51918739 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51918695 and 51918704.

It is not a weakly prime, because it can be changed into another prime (51918719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25959369 + 25959370.

It is an arithmetic number, because the mean of its divisors is an integer number (25959370).

Almost surely, 2^51918739 is an apocalyptic number.

51918739 is a deficient number, since it is larger than the sum of its proper divisors (1).

51918739 is an equidigital number, since it uses as much as digits as its factorization.

51918739 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 51918739 is about 7205.4659113759. The cubic root of 51918739 is about 373.0565863737.

The spelling of 51918739 in words is "fifty-one million, nine hundred eighteen thousand, seven hundred thirty-nine".