231523191 has 20 divisors (see below), whose sum is σ = 346315552. Its totient is φ = 154143648.

The previous prime is 231523147. The next prime is 231523199. The reversal of 231523191 is 191325132.

It is not a de Polignac number, because 231523191 - 2⁷ = 231523063 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231523199) 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 19 ways as a sum of consecutive naturals, for example, 82290 + ... + 85056.

Almost surely, 2^231523191 is an apocalyptic number.

231523191 is a deficient number, since it is larger than the sum of its proper divisors (114792361).

231523191 is a wasteful number, since it uses less digits than its factorization.

231523191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3812 (or 3803 counting only the distinct ones).

The product of its digits is 1620, while the sum is 27.

The square root of 231523191 is about 15215.8861391639. The cubic root of 231523191 is about 614.0421257619.

The spelling of 231523191 in words is "two hundred thirty-one million, five hundred twenty-three thousand, one hundred ninety-one".