115242109 has 2 divisors, whose sum is σ = 115242110. Its totient is φ = 115242108.

The previous prime is 115242079. The next prime is 115242137. The reversal of 115242109 is 901242511.

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., 74563225 + 40678884 = 8635^2 + 6378^2 .

It is a cyclic number.

It is not a de Polignac number, because 115242109 - 2²³ = 106853501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (115242199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57621054 + 57621055.

It is an arithmetic number, because the mean of its divisors is an integer number (57621055).

Almost surely, 2^115242109 is an apocalyptic number.

It is an amenable number.

115242109 is a deficient number, since it is larger than the sum of its proper divisors (1).

115242109 is an equidigital number, since it uses as much as digits as its factorization.

115242109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 115242109 is about 10735.0877499907. The cubic root of 115242109 is about 486.6354384061.

The spelling of 115242109 in words is "one hundred fifteen million, two hundred forty-two thousand, one hundred nine".