189331681 has 16 divisors (see below), whose sum is σ = 238492800. Its totient is φ = 146004480.

The previous prime is 189331657. The next prime is 189331687. The reversal of 189331681 is 186133981.

189331681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189331681 is a prime.

It is a super-3 number, since 3×189331681³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (189331687) 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, 5206 + ... + 20143.

It is an arithmetic number, because the mean of its divisors is an integer number (14905800).

Almost surely, 2^189331681 is an apocalyptic number.

189331681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

189331681 is a deficient number, since it is larger than the sum of its proper divisors (49161119).

189331681 is a wasteful number, since it uses less digits than its factorization.

189331681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25464.

The product of its digits is 31104, while the sum is 40.

The square root of 189331681 is about 13759.7849183772. The cubic root of 189331681 is about 574.2148638964.

The spelling of 189331681 in words is "one hundred eighty-nine million, three hundred thirty-one thousand, six hundred eighty-one".