189189561 has 16 divisors (see below), whose sum is σ = 277014528. Its totient is φ = 113898000.

The previous prime is 189189529. The next prime is 189189569. The reversal of 189189561 is 165981981.

It is not a de Polignac number, because 189189561 - 2⁵ = 189189529 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 189189561.

It is not an unprimeable number, because it can be changed into a prime (189189569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14001 + ... + 23966.

It is an arithmetic number, because the mean of its divisors is an integer number (17313408).

Almost surely, 2^189189561 is an apocalyptic number.

189189561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

189189561 is a deficient number, since it is larger than the sum of its proper divisors (87824967).

189189561 is a wasteful number, since it uses less digits than its factorization.

189189561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38132.

The product of its digits is 155520, while the sum is 48.

The square root of 189189561 is about 13754.6196239663. The cubic root of 189189561 is about 574.0711516488.

The spelling of 189189561 in words is "one hundred eighty-nine million, one hundred eighty-nine thousand, five hundred sixty-one".