51139579 has 2 divisors, whose sum is σ = 51139580. Its totient is φ = 51139578.

The previous prime is 51139573. The next prime is 51139589. The reversal of 51139579 is 97593115.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51139579 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51139573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25569789 + 25569790.

It is an arithmetic number, because the mean of its divisors is an integer number (25569790).

Almost surely, 2^51139579 is an apocalyptic number.

51139579 is a deficient number, since it is larger than the sum of its proper divisors (1).

51139579 is an equidigital number, since it uses as much as digits as its factorization.

51139579 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42525, while the sum is 40.

The square root of 51139579 is about 7151.1942359301. The cubic root of 51139579 is about 371.1809817773.

The spelling of 51139579 in words is "fifty-one million, one hundred thirty-nine thousand, five hundred seventy-nine".