115109521 has 2 divisors, whose sum is σ = 115109522. Its totient is φ = 115109520.

The previous prime is 115109483. The next prime is 115109611. The reversal of 115109521 is 125901511.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80299521 + 34810000 = 8961^2 + 5900^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-115109521 is a prime.

It is not a weakly prime, because it can be changed into another prime (115109321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57554760 + 57554761.

It is an arithmetic number, because the mean of its divisors is an integer number (57554761).

Almost surely, 2^115109521 is an apocalyptic number.

It is an amenable number.

115109521 is a deficient number, since it is larger than the sum of its proper divisors (1).

115109521 is an equidigital number, since it uses as much as digits as its factorization.

115109521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 450, while the sum is 25.

The square root of 115109521 is about 10728.9105225088. The cubic root of 115109521 is about 486.4487393472.

The spelling of 115109521 in words is "one hundred fifteen million, one hundred nine thousand, five hundred twenty-one".