189135579 has 4 divisors (see below), whose sum is σ = 252180776. Its totient is φ = 126090384.

The previous prime is 189135553. The next prime is 189135581. The reversal of 189135579 is 975531981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 975531981 = 3 ⋅325177327.

It is not a de Polignac number, because 189135579 - 2²³ = 180746971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189135539) 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, 31522594 + ... + 31522599.

It is an arithmetic number, because the mean of its divisors is an integer number (63045194).

Almost surely, 2^189135579 is an apocalyptic number.

189135579 is a deficient number, since it is larger than the sum of its proper divisors (63045197).

189135579 is an equidigital number, since it uses as much as digits as its factorization.

189135579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63045196.

The product of its digits is 340200, while the sum is 48.

The square root of 189135579 is about 13752.6571614361. The cubic root of 189135579 is about 574.0165459989.

The spelling of 189135579 in words is "one hundred eighty-nine million, one hundred thirty-five thousand, five hundred seventy-nine".