115561389 has 8 divisors (see below), whose sum is σ = 156608032. Its totient is φ = 75777840.

The previous prime is 115561373. The next prime is 115561417. The reversal of 115561389 is 983165511.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 115561389 - 2⁴ = 115561373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115561319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 315559 + ... + 315924.

It is an arithmetic number, because the mean of its divisors is an integer number (19576004).

Almost surely, 2^115561389 is an apocalyptic number.

It is an amenable number.

115561389 is a deficient number, since it is larger than the sum of its proper divisors (41046643).

115561389 is an equidigital number, since it uses as much as digits as its factorization.

115561389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631547.

The product of its digits is 32400, while the sum is 39.

The square root of 115561389 is about 10749.9483254572. The cubic root of 115561389 is about 487.0844342834.

The spelling of 115561389 in words is "one hundred fifteen million, five hundred sixty-one thousand, three hundred eighty-nine".