189510081 has 4 divisors (see below), whose sum is σ = 252680112. Its totient is φ = 126340052.

The previous prime is 189510071. The next prime is 189510089. The reversal of 189510081 is 180015981.

189510081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 189510081 - 2⁵ = 189510049 is a prime.

It is a super-2 number, since 2×189510081² = 71828141601253122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (189510089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31585011 + ... + 31585016.

It is an arithmetic number, because the mean of its divisors is an integer number (63170028).

Almost surely, 2^189510081 is an apocalyptic number.

It is an amenable number.

189510081 is a deficient number, since it is larger than the sum of its proper divisors (63170031).

189510081 is an equidigital number, since it uses as much as digits as its factorization.

189510081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63170030.

The product of its (nonzero) digits is 2880, while the sum is 33.

The square root of 189510081 is about 13766.2660514753. The cubic root of 189510081 is about 574.3951608457.

The spelling of 189510081 in words is "one hundred eighty-nine million, five hundred ten thousand, eighty-one".