51291923539 has 2 divisors, whose sum is σ = 51291923540. Its totient is φ = 51291923538.

The previous prime is 51291923519. The next prime is 51291923567. The reversal of 51291923539 is 93532919215.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51291923539 - 2⁹ = 51291923027 is a prime.

It is a super-2 number, since 2×51291923539² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51291923492 and 51291923501.

It is not a weakly prime, because it can be changed into another prime (51291923519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25645961769 + 25645961770.

It is an arithmetic number, because the mean of its divisors is an integer number (25645961770).

Almost surely, 2^51291923539 is an apocalyptic number.

51291923539 is a deficient number, since it is larger than the sum of its proper divisors (1).

51291923539 is an equidigital number, since it uses as much as digits as its factorization.

51291923539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 656100, while the sum is 49.

The spelling of 51291923539 in words is "fifty-one billion, two hundred ninety-one million, nine hundred twenty-three thousand, five hundred thirty-nine".