231427689 has 4 divisors (see below), whose sum is σ = 308570256. Its totient is φ = 154285124.

The previous prime is 231427687. The next prime is 231427699. The reversal of 231427689 is 986724132.

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 231427689 - 2¹ = 231427687 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231427689.

It is not an unprimeable number, because it can be changed into a prime (231427687) 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, 38571279 + ... + 38571284.

It is an arithmetic number, because the mean of its divisors is an integer number (77142564).

Almost surely, 2^231427689 is an apocalyptic number.

It is an amenable number.

231427689 is a deficient number, since it is larger than the sum of its proper divisors (77142567).

231427689 is an equidigital number, since it uses as much as digits as its factorization.

231427689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77142566.

The product of its digits is 145152, while the sum is 42.

The square root of 231427689 is about 15212.7475822088. The cubic root of 231427689 is about 613.9576845217.

It can be divided in two parts, 2314 and 27689, that added together give a palindrome (30003).

The spelling of 231427689 in words is "two hundred thirty-one million, four hundred twenty-seven thousand, six hundred eighty-nine".