115581409 has 2 divisors, whose sum is σ = 115581410. Its totient is φ = 115581408.

The previous prime is 115581391. The next prime is 115581437. The reversal of 115581409 is 904185511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 108743184 + 6838225 = 10428^2 + 2615^2 .

It is a cyclic number.

It is not a de Polignac number, because 115581409 - 2¹³ = 115573217 is a prime.

It is not a weakly prime, because it can be changed into another prime (115581439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57790704 + 57790705.

It is an arithmetic number, because the mean of its divisors is an integer number (57790705).

Almost surely, 2^115581409 is an apocalyptic number.

It is an amenable number.

115581409 is a deficient number, since it is larger than the sum of its proper divisors (1).

115581409 is an equidigital number, since it uses as much as digits as its factorization.

115581409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 34.

The square root of 115581409 is about 10750.8794523983. The cubic root of 115581409 is about 487.1125603655.

The spelling of 115581409 in words is "one hundred fifteen million, five hundred eighty-one thousand, four hundred nine".