189238133 has 4 divisors (see below), whose sum is σ = 216272160. Its totient is φ = 162204108.

The previous prime is 189238123. The next prime is 189238139. The reversal of 189238133 is 331832981.

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: 331832981 = 277 ⋅1197953.

It is a cyclic number.

It is not a de Polignac number, because 189238133 - 2⁴ = 189238117 is a prime.

It is a super-2 number, since 2×189238133² = 71622141962651378, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189238139) 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, 13517003 + ... + 13517016.

It is an arithmetic number, because the mean of its divisors is an integer number (54068040).

Almost surely, 2^189238133 is an apocalyptic number.

It is an amenable number.

189238133 is a deficient number, since it is larger than the sum of its proper divisors (27034027).

189238133 is an equidigital number, since it uses as much as digits as its factorization.

189238133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27034026.

The product of its digits is 31104, while the sum is 38.

The square root of 189238133 is about 13756.3851719847. The cubic root of 189238133 is about 574.1202759202.

The spelling of 189238133 in words is "one hundred eighty-nine million, two hundred thirty-eight thousand, one hundred thirty-three".