189128031 has 4 divisors (see below), whose sum is σ = 252170712. Its totient is φ = 126085352.

The previous prime is 189128003. The next prime is 189128063. The reversal of 189128031 is 130821981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 130821981 = 3 ⋅43607327.

It is a cyclic number.

It is not a de Polignac number, because 189128031 - 2¹¹ = 189125983 is a prime.

It is a super-2 number, since 2×189128031² = 71538824219873922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 189127983 and 189128001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189128231) 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, 31521336 + ... + 31521341.

It is an arithmetic number, because the mean of its divisors is an integer number (63042678).

Almost surely, 2^189128031 is an apocalyptic number.

189128031 is a deficient number, since it is larger than the sum of its proper divisors (63042681).

189128031 is an equidigital number, since it uses as much as digits as its factorization.

189128031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63042680.

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 189128031 is about 13752.3827390020. The cubic root of 189128031 is about 574.0089099695.

The spelling of 189128031 in words is "one hundred eighty-nine million, one hundred twenty-eight thousand, thirty-one".