189231031 has 16 divisors (see below), whose sum is σ = 212468256. Its totient is φ = 167040000.

The previous prime is 189231019. The next prime is 189231047. The reversal of 189231031 is 130132981.

It is a cyclic number.

It is not a de Polignac number, because 189231031 - 2²¹ = 187133879 is a prime.

It is a super-2 number, since 2×189231031² = 71616766186645922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189231011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107821 + ... + 109561.

It is an arithmetic number, because the mean of its divisors is an integer number (13279266).

Almost surely, 2^189231031 is an apocalyptic number.

189231031 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

189231031 is a deficient number, since it is larger than the sum of its proper divisors (23237225).

189231031 is a wasteful number, since it uses less digits than its factorization.

189231031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2034.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 189231031 is about 13756.1270348889. The cubic root of 189231031 is about 574.1130936941.

It can be divided in two parts, 1892 and 31031, that added together give a palindrome (32923).

The spelling of 189231031 in words is "one hundred eighty-nine million, two hundred thirty-one thousand, thirty-one".