231557089 has 3 divisors (see below), whose sum is σ = 231572307. Its totient is φ = 231541872.

The previous prime is 231557071. The next prime is 231557111. The reversal of 231557089 is 980755132.

The square root of 231557089 is 15217.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 197824225 + 33732864 = 14065^2 + 5808^2 .

It is not a de Polignac number, because 231557089 - 2²³ = 223168481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231557189) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 7609 + ... + 22825.

It is an arithmetic number, because the mean of its divisors is an integer number (77190769).

Almost surely, 2^231557089 is an apocalyptic number.

231557089 is the 15217-th square number.

231557089 is the 7609-th centered octagonal number.

It is an amenable number.

231557089 is a deficient number, since it is larger than the sum of its proper divisors (15218).

231557089 is an frugal number, since it uses more digits than its factorization.

231557089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30434 (or 15217 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 40.

The cubic root of 231557089 is about 614.0720922116.

The spelling of 231557089 in words is "two hundred thirty-one million, five hundred fifty-seven thousand, eighty-nine".