189205631 has 8 divisors (see below), whose sum is σ = 201800160. Its totient is φ = 176773888.

The previous prime is 189205609. The next prime is 189205637. The reversal of 189205631 is 136502981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-189205631 is a prime.

It is a super-2 number, since 2×189205631² = 71597541604216322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 189205591 and 189205600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189205637) 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, 38291 + ... + 42948.

It is an arithmetic number, because the mean of its divisors is an integer number (25225020).

Almost surely, 2^189205631 is an apocalyptic number.

189205631 is a deficient number, since it is larger than the sum of its proper divisors (12594529).

189205631 is a wasteful number, since it uses less digits than its factorization.

189205631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81393.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 189205631 is about 13755.2037789340. The cubic root of 189205631 is about 574.0874052979.

The spelling of 189205631 in words is "one hundred eighty-nine million, two hundred five thousand, six hundred thirty-one".