231028089 has 16 divisors (see below), whose sum is σ = 318935040. Its totient is φ = 148600080.

The previous prime is 231028081. The next prime is 231028097. The reversal of 231028089 is 980820132.

It is an interprime number because it is at equal distance from previous prime (231028081) and next prime (231028097).

It is not a de Polignac number, because 231028089 - 2³ = 231028081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (231028081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28692 + ... + 35850.

It is an arithmetic number, because the mean of its divisors is an integer number (19933440).

Almost surely, 2^231028089 is an apocalyptic number.

It is an amenable number.

231028089 is a deficient number, since it is larger than the sum of its proper divisors (87906951).

231028089 is a wasteful number, since it uses less digits than its factorization.

231028089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7540.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 231028089 is about 15199.6081857395. The cubic root of 231028089 is about 613.6041128390.

The spelling of 231028089 in words is "two hundred thirty-one million, twenty-eight thousand, eighty-nine".