231981319 has 4 divisors (see below), whose sum is σ = 232369200. Its totient is φ = 231593440.

The previous prime is 231981313. The next prime is 231981329. The reversal of 231981319 is 913189132.

231981319 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 231981319 - 2³ = 231981311 is a prime.

It is a super-2 number, since 2×231981319² = 107630664729959522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231981311) 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, 193042 + ... + 194239.

It is an arithmetic number, because the mean of its divisors is an integer number (58092300).

Almost surely, 2^231981319 is an apocalyptic number.

231981319 is a deficient number, since it is larger than the sum of its proper divisors (387881).

231981319 is an equidigital number, since it uses as much as digits as its factorization.

231981319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387880.

The product of its digits is 11664, while the sum is 37.

The square root of 231981319 is about 15230.9329655146. The cubic root of 231981319 is about 614.4468721799.

It can be divided in two parts, 2319 and 81319, that added together give a palindrome (83638).

The spelling of 231981319 in words is "two hundred thirty-one million, nine hundred eighty-one thousand, three hundred nineteen".