189311645 has 8 divisors (see below), whose sum is σ = 227249880. Its totient is φ = 151398720.

The previous prime is 189311627. The next prime is 189311659. The reversal of 189311645 is 546113981.

189311645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 63266116 + 126045529 = 7954^2 + 11227^2 .

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

It is not a de Polignac number, because 189311645 - 2⁶ = 189311581 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 189311599 and 189311608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20411 + ... + 28199.

It is an arithmetic number, because the mean of its divisors is an integer number (28406235).

Almost surely, 2^189311645 is an apocalyptic number.

It is an amenable number.

189311645 is a deficient number, since it is larger than the sum of its proper divisors (37938235).

189311645 is an equidigital number, since it uses as much as digits as its factorization.

189311645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12655.

The product of its digits is 25920, while the sum is 38.

The square root of 189311645 is about 13759.0568354085. The cubic root of 189311645 is about 574.1946077779.

The spelling of 189311645 in words is "one hundred eighty-nine million, three hundred eleven thousand, six hundred forty-five".