115881621 has 16 divisors (see below), whose sum is σ = 159364800. Its totient is φ = 74852480.

The previous prime is 115881617. The next prime is 115881631. The reversal of 115881621 is 126188511.

It is a cyclic number.

It is not a de Polignac number, because 115881621 - 2² = 115881617 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115881631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15166 + ... + 21488.

It is an arithmetic number, because the mean of its divisors is an integer number (9960300).

Almost surely, 2^115881621 is an apocalyptic number.

It is an amenable number.

115881621 is a deficient number, since it is larger than the sum of its proper divisors (43483179).

115881621 is a wasteful number, since it uses less digits than its factorization.

115881621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6516.

The product of its digits is 3840, while the sum is 33.

The square root of 115881621 is about 10764.8326043650. The cubic root of 115881621 is about 487.5339389915.

The spelling of 115881621 in words is "one hundred fifteen million, eight hundred eighty-one thousand, six hundred twenty-one".