51919739 has 2 divisors, whose sum is σ = 51919740. Its totient is φ = 51919738.

The previous prime is 51919733. The next prime is 51919753. The reversal of 51919739 is 93791915.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51919739 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51919739.

It is not a weakly prime, because it can be changed into another prime (51919733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25959869 + 25959870.

It is an arithmetic number, because the mean of its divisors is an integer number (25959870).

Almost surely, 2^51919739 is an apocalyptic number.

51919739 is a deficient number, since it is larger than the sum of its proper divisors (1).

51919739 is an equidigital number, since it uses as much as digits as its factorization.

51919739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 76545, while the sum is 44.

The square root of 51919739 is about 7205.5353028071. The cubic root of 51919739 is about 373.0589814896.

The spelling of 51919739 in words is "fifty-one million, nine hundred nineteen thousand, seven hundred thirty-nine".