189186981 has 16 divisors (see below), whose sum is σ = 265377600. Its totient is φ = 119708288.

The previous prime is 189186979. The next prime is 189186989. The reversal of 189186981 is 189681981.

189186981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 189186981 - 2¹ = 189186979 is a prime.

It is a super-2 number, since 2×189186981² = 71583427559788722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189186989) 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, 13296 + ... + 23561.

It is an arithmetic number, because the mean of its divisors is an integer number (16586100).

Almost surely, 2^189186981 is an apocalyptic number.

It is an amenable number.

189186981 is a deficient number, since it is larger than the sum of its proper divisors (76190619).

189186981 is a wasteful number, since it uses less digits than its factorization.

189186981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36948.

The product of its digits is 248832, while the sum is 51.

The square root of 189186981 is about 13754.5258369745. The cubic root of 189186981 is about 574.0685420786.

The spelling of 189186981 in words is "one hundred eighty-nine million, one hundred eighty-six thousand, nine hundred eighty-one".