189668831 has 8 divisors (see below), whose sum is σ = 208622928. Its totient is φ = 172425000.

The previous prime is 189668797. The next prime is 189668837. The reversal of 189668831 is 138866981.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-189668831 is a prime.

It is a super-2 number, since 2×189668831² = 71948530905813122, 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 189668831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189668837) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69920 + ... + 72581.

It is an arithmetic number, because the mean of its divisors is an integer number (26077866).

Almost surely, 2^189668831 is an apocalyptic number.

189668831 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

189668831 is a deficient number, since it is larger than the sum of its proper divisors (18954097).

189668831 is an equidigital number, since it uses as much as digits as its factorization.

189668831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142534 (or 142512 counting only the distinct ones).

The product of its digits is 497664, while the sum is 50.

The square root of 189668831 is about 13772.0307507644. The cubic root of 189668831 is about 574.5555037355. Note that the first 4 decimals are identical.

The spelling of 189668831 in words is "one hundred eighty-nine million, six hundred sixty-eight thousand, eight hundred thirty-one".