189521613 has 10 divisors (see below), whose sum is σ = 283112654. Its totient is φ = 126347688.

The previous prime is 189521611. The next prime is 189521617. The reversal of 189521613 is 316125981.

189521613 is a `hidden beast` number, since 18 + 9 + 5 + 21 + 613 = 666.

It can be written as a sum of positive squares in only one way, i.e., 140493609 + 49028004 = 11853^2 + 7002^2 .

It is not a de Polignac number, because 189521613 - 2¹ = 189521611 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189521611) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1169806 + ... + 1169967.

Almost surely, 2^189521613 is an apocalyptic number.

It is an amenable number.

189521613 is a deficient number, since it is larger than the sum of its proper divisors (93591041).

189521613 is an equidigital number, since it uses as much as digits as its factorization.

189521613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2339785 (or 2339776 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 189521613 is about 13766.6848950646. The cubic root of 189521613 is about 574.4068115727.

The spelling of 189521613 in words is "one hundred eighty-nine million, five hundred twenty-one thousand, six hundred thirteen".