115215109 has 2 divisors, whose sum is σ = 115215110. Its totient is φ = 115215108.

The previous prime is 115215049. The next prime is 115215131. The reversal of 115215109 is 901512511.

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., 98446084 + 16769025 = 9922^2 + 4095^2 .

It is a cyclic number.

It is not a de Polignac number, because 115215109 - 2¹¹ = 115213061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (115615109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57607554 + 57607555.

It is an arithmetic number, because the mean of its divisors is an integer number (57607555).

Almost surely, 2^115215109 is an apocalyptic number.

It is an amenable number.

115215109 is a deficient number, since it is larger than the sum of its proper divisors (1).

115215109 is an equidigital number, since it uses as much as digits as its factorization.

115215109 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 115215109 is about 10733.8301179029. The cubic root of 115215109 is about 486.5974309359.

It can be divided in two parts, 1152 and 15109, that added together give a palindrome (16261).

The spelling of 115215109 in words is "one hundred fifteen million, two hundred fifteen thousand, one hundred nine".