115031921 has 2 divisors, whose sum is σ = 115031922. Its totient is φ = 115031920.

The previous prime is 115031899. The next prime is 115031933. The reversal of 115031921 is 129130511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113720896 + 1311025 = 10664^2 + 1145^2 .

It is an emirp because it is prime and its reverse (129130511) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-115031921 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (115033921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57515960 + 57515961.

It is an arithmetic number, because the mean of its divisors is an integer number (57515961).

Almost surely, 2^115031921 is an apocalyptic number.

It is an amenable number.

115031921 is a deficient number, since it is larger than the sum of its proper divisors (1).

115031921 is an equidigital number, since it uses as much as digits as its factorization.

115031921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 270, while the sum is 23.

The square root of 115031921 is about 10725.2935157971. The cubic root of 115031921 is about 486.3394031614.

The spelling of 115031921 in words is "one hundred fifteen million, thirty-one thousand, nine hundred twenty-one".