231456789 has 6 divisors (see below), whose sum is σ = 334326486. Its totient is φ = 154304520.

The previous prime is 231456773. The next prime is 231456809. The reversal of 231456789 is 987654132.

231456789 is a `hidden beast` number, since 2 + 3 + 1 + 4 + 567 + 89 = 666.

It can be written as a sum of positive squares in only one way, i.e., 181117764 + 50339025 = 13458^2 + 7095^2 .

It is not a de Polignac number, because 231456789 - 2⁴ = 231456773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231456739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12858702 + ... + 12858719.

It is an arithmetic number, because the mean of its divisors is an integer number (55721081).

Almost surely, 2^231456789 is an apocalyptic number.

It is an amenable number.

231456789 is a deficient number, since it is larger than the sum of its proper divisors (102869697).

231456789 is a wasteful number, since it uses less digits than its factorization.

231456789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25717427 (or 25717424 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 231456789 is about 15213.7039868666. The cubic root of 231456789 is about 613.9834167060.

The spelling of 231456789 in words is "two hundred thirty-one million, four hundred fifty-six thousand, seven hundred eighty-nine".