115431521 has 2 divisors, whose sum is σ = 115431522. Its totient is φ = 115431520.

The previous prime is 115431499. The next prime is 115431539. The reversal of 115431521 is 125134511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87984400 + 27447121 = 9380^2 + 5239^2 .

It is a cyclic number.

It is not a de Polignac number, because 115431521 - 2¹⁴ = 115415137 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (115431541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57715760 + 57715761.

It is an arithmetic number, because the mean of its divisors is an integer number (57715761).

Almost surely, 2^115431521 is an apocalyptic number.

It is an amenable number.

115431521 is a deficient number, since it is larger than the sum of its proper divisors (1).

115431521 is an equidigital number, since it uses as much as digits as its factorization.

115431521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 600, while the sum is 23.

The square root of 115431521 is about 10743.9062263220. The cubic root of 115431521 is about 486.9019039053.

The spelling of 115431521 in words is "one hundred fifteen million, four hundred thirty-one thousand, five hundred twenty-one".