115679981 has 2 divisors, whose sum is σ = 115679982. Its totient is φ = 115679980.

The previous prime is 115679891. The next prime is 115680007. The reversal of 115679981 is 189976511.

Together with previous prime (115679891) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105247081 + 10432900 = 10259^2 + 3230^2 .

It is an emirp because it is prime and its reverse (189976511) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-115679981 is a prime.

It is a super-2 number, since 2×115679981² = 26763716008320722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (115679281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57839990 + 57839991.

It is an arithmetic number, because the mean of its divisors is an integer number (57839991).

Almost surely, 2^115679981 is an apocalyptic number.

It is an amenable number.

115679981 is a deficient number, since it is larger than the sum of its proper divisors (1).

115679981 is an equidigital number, since it uses as much as digits as its factorization.

115679981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 47.

The square root of 115679981 is about 10755.4628445270. The cubic root of 115679981 is about 487.2509967465.

The spelling of 115679981 in words is "one hundred fifteen million, six hundred seventy-nine thousand, nine hundred eighty-one".