189012531 has 4 divisors (see below), whose sum is σ = 252016712. Its totient is φ = 126008352.

The previous prime is 189012529. The next prime is 189012533. The reversal of 189012531 is 135210981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135210981 = 3 ⋅45070327.

It is an interprime number because it is at equal distance from previous prime (189012529) and next prime (189012533).

It is not a de Polignac number, because 189012531 - 2¹ = 189012529 is a prime.

It is a super-2 number, since 2×189012531² = 71451473750051922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189012533) 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, 31502086 + ... + 31502091.

It is an arithmetic number, because the mean of its divisors is an integer number (63004178).

Almost surely, 2^189012531 is an apocalyptic number.

189012531 is a deficient number, since it is larger than the sum of its proper divisors (63004181).

189012531 is an equidigital number, since it uses as much as digits as its factorization.

189012531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63004180.

The product of its (nonzero) digits is 2160, while the sum is 30.

The square root of 189012531 is about 13748.1828253773. The cubic root of 189012531 is about 573.8920375888.

The spelling of 189012531 in words is "one hundred eighty-nine million, twelve thousand, five hundred thirty-one".