115511712731 has 2 divisors, whose sum is σ = 115511712732. Its totient is φ = 115511712730.

The previous prime is 115511712683. The next prime is 115511712733. The reversal of 115511712731 is 137217115511.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-115511712731 is a prime.

It is a super-2 number, since 2×115511712731² (a number of 23 digits) contains 22 as substring.

Together with 115511712733, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 115511712691 and 115511712700.

It is not a weakly prime, because it can be changed into another prime (115511712733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57755856365 + 57755856366.

It is an arithmetic number, because the mean of its divisors is an integer number (57755856366).

Almost surely, 2^115511712731 is an apocalyptic number.

115511712731 is a deficient number, since it is larger than the sum of its proper divisors (1).

115511712731 is an equidigital number, since it uses as much as digits as its factorization.

115511712731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7350, while the sum is 35.

The spelling of 115511712731 in words is "one hundred fifteen billion, five hundred eleven million, seven hundred twelve thousand, seven hundred thirty-one".