115691281 has 2 divisors, whose sum is σ = 115691282. Its totient is φ = 115691280.

The previous prime is 115691167. The next prime is 115691297. The reversal of 115691281 is 182196511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72250000 + 43441281 = 8500^2 + 6591^2 .

It is a cyclic number.

It is not a de Polignac number, because 115691281 - 2¹³ = 115683089 is a prime.

It is a super-2 number, since 2×115691281² = 26768944998841922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (115691981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57845640 + 57845641.

It is an arithmetic number, because the mean of its divisors is an integer number (57845641).

Almost surely, 2^115691281 is an apocalyptic number.

It is an amenable number.

115691281 is a deficient number, since it is larger than the sum of its proper divisors (1).

115691281 is an equidigital number, since it uses as much as digits as its factorization.

115691281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 34.

The square root of 115691281 is about 10755.9881461445. The cubic root of 115691281 is about 487.2668616552.

The spelling of 115691281 in words is "one hundred fifteen million, six hundred ninety-one thousand, two hundred eighty-one".