51231123539 has 2 divisors, whose sum is σ = 51231123540. Its totient is φ = 51231123538.

The previous prime is 51231123533. The next prime is 51231123553. The reversal of 51231123539 is 93532113215.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51231123539 - 2³² = 46936156243 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 51231123499 and 51231123508.

It is not a weakly prime, because it can be changed into another prime (51231123533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25615561769 + 25615561770.

It is an arithmetic number, because the mean of its divisors is an integer number (25615561770).

Almost surely, 2^51231123539 is an apocalyptic number.

51231123539 is a deficient number, since it is larger than the sum of its proper divisors (1).

51231123539 is an equidigital number, since it uses as much as digits as its factorization.

51231123539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24300, while the sum is 35.

The spelling of 51231123539 in words is "fifty-one billion, two hundred thirty-one million, one hundred twenty-three thousand, five hundred thirty-nine".