189521 has 4 divisors (see below), whose sum is σ = 192000. Its totient is φ = 187044.

The previous prime is 189517. The next prime is 189523. The reversal of 189521 is 125981.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 125981 = 53 ⋅2377.

It is a cyclic number.

It is not a de Polignac number, because 189521 - 2² = 189517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189523) 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, 1121 + ... + 1278.

It is an arithmetic number, because the mean of its divisors is an integer number (48000).

2¹⁸⁹⁵²¹ is an apocalyptic number.

It is an amenable number.

189521 is a deficient number, since it is larger than the sum of its proper divisors (2479).

189521 is an equidigital number, since it uses as much as digits as its factorization.

189521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2478.

The product of its digits is 720, while the sum is 26.

The square root of 189521 is about 435.3400969357. The cubic root of 189521 is about 57.4406192273.

The spelling of 189521 in words is "one hundred eighty-nine thousand, five hundred twenty-one".