115308521 has 2 divisors, whose sum is σ = 115308522. Its totient is φ = 115308520.

The previous prime is 115308503. The next prime is 115308527. The reversal of 115308521 is 125803511.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72863296 + 42445225 = 8536^2 + 6515^2 .

It is an emirp because it is prime and its reverse (125803511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 115308521 - 2¹⁴ = 115292137 is a prime.

It is not a weakly prime, because it can be changed into another prime (115308527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57654260 + 57654261.

It is an arithmetic number, because the mean of its divisors is an integer number (57654261).

Almost surely, 2^115308521 is an apocalyptic number.

It is an amenable number.

115308521 is a deficient number, since it is larger than the sum of its proper divisors (1).

115308521 is an equidigital number, since it uses as much as digits as its factorization.

115308521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1200, while the sum is 26.

The square root of 115308521 is about 10738.1805255825. The cubic root of 115308521 is about 486.7289002689.

The spelling of 115308521 in words is "one hundred fifteen million, three hundred eight thousand, five hundred twenty-one".