51393242639 has 2 divisors, whose sum is σ = 51393242640. Its totient is φ = 51393242638.

The previous prime is 51393242603. The next prime is 51393242689. The reversal of 51393242639 is 93624239315.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51393242639 is a prime.

It is a super-2 number, since 2×51393242639² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51393242593 and 51393242602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51393242689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25696621319 + 25696621320.

It is an arithmetic number, because the mean of its divisors is an integer number (25696621320).

Almost surely, 2^51393242639 is an apocalyptic number.

51393242639 is a deficient number, since it is larger than the sum of its proper divisors (1).

51393242639 is an equidigital number, since it uses as much as digits as its factorization.

51393242639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1049760, while the sum is 47.

The spelling of 51393242639 in words is "fifty-one billion, three hundred ninety-three million, two hundred forty-two thousand, six hundred thirty-nine".