231023789 has 2 divisors, whose sum is σ = 231023790. Its totient is φ = 231023788.

The previous prime is 231023759. The next prime is 231023791. The reversal of 231023789 is 987320132.

231023789 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121925764 + 109098025 = 11042^2 + 10445^2 .

It is a cyclic number.

It is not a de Polignac number, because 231023789 - 2²⁴ = 214246573 is a prime.

Together with 231023791, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_12695840 and since 231023789 and 12695840 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231023759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115511894 + 115511895.

It is an arithmetic number, because the mean of its divisors is an integer number (115511895).

Almost surely, 2^231023789 is an apocalyptic number.

It is an amenable number.

231023789 is a deficient number, since it is larger than the sum of its proper divisors (1).

231023789 is an equidigital number, since it uses as much as digits as its factorization.

231023789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 231023789 is about 15199.4667340667. The cubic root of 231023789 is about 613.6003059223.

The spelling of 231023789 in words is "two hundred thirty-one million, twenty-three thousand, seven hundred eighty-nine".