118613881 has 3 divisors (see below), whose sum is σ = 118624773. Its totient is φ = 118602990.

The previous prime is 118613867. The next prime is 118613899. The reversal of 118613881 is 188316811.

The square root of 118613881 is 10891.

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 118613881 - 2¹⁹ = 118089593 is a prime.

It is a super-2 number, since 2×118613881² = 28138505531764322, 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 118613881.

It is not an unprimeable number, because it can be changed into a prime (118613801) 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, 5446 + ... + 16336.

It is an arithmetic number, because the mean of its divisors is an integer number (39541591).

Almost surely, 2^118613881 is an apocalyptic number.

118613881 is the 10891-st square number.

118613881 is the 5446-th centered octagonal number.

It is an amenable number.

118613881 is a deficient number, since it is larger than the sum of its proper divisors (10892).

118613881 is an frugal number, since it uses more digits than its factorization.

118613881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21782 (or 10891 counting only the distinct ones).

The product of its digits is 9216, while the sum is 37.

The cubic root of 118613881 is about 491.3359088943.

Multiplying 118613881 by its product of digits (9216), we get a square (1093145527296 = 1045536²).

The spelling of 118613881 in words is "one hundred eighteen million, six hundred thirteen thousand, eight hundred eighty-one".