188631489 has 16 divisors (see below), whose sum is σ = 255507200. Its totient is φ = 123762816.

The previous prime is 188631431. The next prime is 188631491. The reversal of 188631489 is 984136881.

188631489 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-188631489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (188631089) 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, 181032 + ... + 182070.

It is an arithmetic number, because the mean of its divisors is an integer number (15969200).

Almost surely, 2^188631489 is an apocalyptic number.

It is an amenable number.

188631489 is a deficient number, since it is larger than the sum of its proper divisors (66875711).

188631489 is a wasteful number, since it uses less digits than its factorization.

188631489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1944.

The product of its digits is 331776, while the sum is 48.

The square root of 188631489 is about 13734.3179299156. The cubic root of 188631489 is about 573.5061300486.

The spelling of 188631489 in words is "one hundred eighty-eight million, six hundred thirty-one thousand, four hundred eighty-nine".