231445191 has 16 divisors (see below), whose sum is σ = 328165344. Its totient is φ = 144589824.

The previous prime is 231445169. The next prime is 231445217. The reversal of 231445191 is 191544132.

It is not a de Polignac number, because 231445191 - 2⁷ = 231445063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231445091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2145 + ... + 21621.

It is an arithmetic number, because the mean of its divisors is an integer number (20510334).

Almost surely, 2^231445191 is an apocalyptic number.

231445191 is a deficient number, since it is larger than the sum of its proper divisors (96720153).

231445191 is a wasteful number, since it uses less digits than its factorization.

231445191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19730.

The product of its digits is 4320, while the sum is 30.

The square root of 231445191 is about 15213.3228125877. The cubic root of 231445191 is about 613.9731612300.

The spelling of 231445191 in words is "two hundred thirty-one million, four hundred forty-five thousand, one hundred ninety-one".