115717831 has 2 divisors, whose sum is σ = 115717832. Its totient is φ = 115717830.

The previous prime is 115717829. The next prime is 115717841. The reversal of 115717831 is 138717511.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 115717831 - 2¹ = 115717829 is a prime.

It is a super-2 number, since 2×115717831² = 26781232822689122, which contains 22 as substring.

Together with 115717829, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (115717841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57858915 + 57858916.

It is an arithmetic number, because the mean of its divisors is an integer number (57858916).

Almost surely, 2^115717831 is an apocalyptic number.

115717831 is a deficient number, since it is larger than the sum of its proper divisors (1).

115717831 is an equidigital number, since it uses as much as digits as its factorization.

115717831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5880, while the sum is 34.

The square root of 115717831 is about 10757.2222715718. Note that the first 4 decimals coincide. The cubic root of 115717831 is about 487.3041331060.

The spelling of 115717831 in words is "one hundred fifteen million, seven hundred seventeen thousand, eight hundred thirty-one".