231747089 has 4 divisors (see below), whose sum is σ = 264853824. Its totient is φ = 198640356.

The previous prime is 231747071. The next prime is 231747097. The reversal of 231747089 is 980747132.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 231747089 - 2¹² = 231742993 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (231747029) 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, 16553357 + ... + 16553370.

It is an arithmetic number, because the mean of its divisors is an integer number (66213456).

Almost surely, 2^231747089 is an apocalyptic number.

It is an amenable number.

231747089 is a deficient number, since it is larger than the sum of its proper divisors (33106735).

231747089 is an equidigital number, since it uses as much as digits as its factorization.

231747089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33106734.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 231747089 is about 15223.2417375538. The cubic root of 231747089 is about 614.2400015611.

The spelling of 231747089 in words is "two hundred thirty-one million, seven hundred forty-seven thousand, eighty-nine".