231591671 has 4 divisors (see below), whose sum is σ = 233979312. Its totient is φ = 229204032.

The previous prime is 231591649. The next prime is 231591673. The reversal of 231591671 is 176195132.

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 231591671 - 2²² = 227397367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231591673) 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, 1193675 + ... + 1193868.

It is an arithmetic number, because the mean of its divisors is an integer number (58494828).

Almost surely, 2^231591671 is an apocalyptic number.

231591671 is a deficient number, since it is larger than the sum of its proper divisors (2387641).

231591671 is an equidigital number, since it uses as much as digits as its factorization.

231591671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2387640.

The product of its digits is 11340, while the sum is 35.

The square root of 231591671 is about 15218.1362525113. The cubic root of 231591671 is about 614.1026603163.

The spelling of 231591671 in words is "two hundred thirty-one million, five hundred ninety-one thousand, six hundred seventy-one".