115397731 has 2 divisors, whose sum is σ = 115397732. Its totient is φ = 115397730.

The previous prime is 115397729. The next prime is 115397753. The reversal of 115397731 is 137793511.

It is a weak prime.

It is an emirp because it is prime and its reverse (137793511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 115397731 - 2¹ = 115397729 is a prime.

It is a super-2 number, since 2×115397731² = 26633272639896722, which contains 22 as substring.

Together with 115397729, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (115397701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57698865 + 57698866.

It is an arithmetic number, because the mean of its divisors is an integer number (57698866).

Almost surely, 2^115397731 is an apocalyptic number.

115397731 is a deficient number, since it is larger than the sum of its proper divisors (1).

115397731 is an equidigital number, since it uses as much as digits as its factorization.

115397731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19845, while the sum is 37.

The square root of 115397731 is about 10742.3335919157. Note that the first 3 decimals coincide. The cubic root of 115397731 is about 486.8543893824.

The spelling of 115397731 in words is "one hundred fifteen million, three hundred ninety-seven thousand, seven hundred thirty-one".