231491319 has 8 divisors (see below), whose sum is σ = 310621680. Its totient is φ = 153344256.

The previous prime is 231491287. The next prime is 231491321. The reversal of 231491319 is 913194132.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 231491319 - 2⁵ = 231491287 is a prime.

It is a super-2 number, since 2×231491319² = 107176461544719522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 231491319.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231491339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 245274 + ... + 246215.

It is an arithmetic number, because the mean of its divisors is an integer number (38827710).

Almost surely, 2^231491319 is an apocalyptic number.

231491319 is a deficient number, since it is larger than the sum of its proper divisors (79130361).

231491319 is a wasteful number, since it uses less digits than its factorization.

231491319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491649.

The product of its digits is 5832, while the sum is 33.

The square root of 231491319 is about 15214.8387766680. The cubic root of 231491319 is about 614.0139476649.

The spelling of 231491319 in words is "two hundred thirty-one million, four hundred ninety-one thousand, three hundred nineteen".