189575981 has 8 divisors (see below), whose sum is σ = 217400064. Its totient is φ = 161937360.

The previous prime is 189575941. The next prime is 189575989.

It is a happy number.

189575981 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is not a de Polignac number, because 189575981 - 2⁶ = 189575917 is a prime.

It is a super-2 number, since 2×189575981² = 71878105144224722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189575989) 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, 44165 + ... + 48266.

It is an arithmetic number, because the mean of its divisors is an integer number (27175008).

Almost surely, 2^189575981 is an apocalyptic number.

It is an amenable number.

189575981 is a deficient number, since it is larger than the sum of its proper divisors (27824083).

189575981 is an equidigital number, since it uses as much as digits as its factorization.

189575981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92731.

The product of its digits is 907200, while the sum is 53.

The square root of 189575981 is about 13768.6593755529. The cubic root of 189575981 is about 574.4617329495.

The spelling of 189575981 in words is "one hundred eighty-nine million, five hundred seventy-five thousand, nine hundred eighty-one".