231691347 has 20 divisors (see below), whose sum is σ = 346720176. Its totient is φ = 154187280.

The previous prime is 231691321. The next prime is 231691399. The reversal of 231691347 is 743196132.

It is not a de Polignac number, because 231691347 - 2⁸ = 231691091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (231891347) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 50197 + ... + 54617.

Almost surely, 2^231691347 is an apocalyptic number.

231691347 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

231691347 is a deficient number, since it is larger than the sum of its proper divisors (115028829).

231691347 is an equidigital number, since it uses as much as digits as its factorization.

231691347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5080 (or 5071 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 231691347 is about 15221.4108084632. The cubic root of 231691347 is about 614.1907500087.

The spelling of 231691347 in words is "two hundred thirty-one million, six hundred ninety-one thousand, three hundred forty-seven".