115398181 has 4 divisors (see below), whose sum is σ = 116979052. Its totient is φ = 113817312.

The previous prime is 115398161. The next prime is 115398203. The reversal of 115398181 is 181893511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 181893511 = 227 ⋅801293.

It can be written as a sum of positive squares in 2 ways, for example, as 95238081 + 20160100 = 9759^2 + 4490^2 .

It is a cyclic number.

It is not a de Polignac number, because 115398181 - 2²¹ = 113301029 is a prime.

It is a super-2 number, since 2×115398181² = 26633480356217522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 115398181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115398131) 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 in 3 ways as a sum of consecutive naturals, for example, 790326 + ... + 790471.

It is an arithmetic number, because the mean of its divisors is an integer number (29244763).

Almost surely, 2^115398181 is an apocalyptic number.

It is an amenable number.

115398181 is a deficient number, since it is larger than the sum of its proper divisors (1580871).

115398181 is an equidigital number, since it uses as much as digits as its factorization.

115398181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1580870.

The product of its digits is 8640, while the sum is 37.

The square root of 115398181 is about 10742.3545370650. The cubic root of 115398181 is about 486.8550222204.

The spelling of 115398181 in words is "one hundred fifteen million, three hundred ninety-eight thousand, one hundred eighty-one".