115561243249 has 3 divisors (see below), whose sum is σ = 115561583193. Its totient is φ = 115560903306.

The previous prime is 115561243241. The next prime is 115561243261. The reversal of 115561243249 is 942342165511.

It is a happy number.

The square root of 115561243249 is 339943.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 115561243249 - 2³ = 115561243241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (115561243241) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 169972 + ... + 509914.

It is an arithmetic number, because the mean of its divisors is an integer number (38520527731).

Almost surely, 2^115561243249 is an apocalyptic number.

115561243249 is the 339943-rd square number.

115561243249 is the 169972-nd centered octagonal number.

It is an amenable number.

115561243249 is a deficient number, since it is larger than the sum of its proper divisors (339944).

115561243249 is an frugal number, since it uses more digits than its factorization.

115561243249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679886 (or 339943 counting only the distinct ones).

The product of its digits is 259200, while the sum is 43.

The spelling of 115561243249 in words is "one hundred fifteen billion, five hundred sixty-one million, two hundred forty-three thousand, two hundred forty-nine".