231721271 has 4 divisors (see below), whose sum is σ = 245351952. Its totient is φ = 218090592.

The previous prime is 231721253. The next prime is 231721277. The reversal of 231721271 is 172127132.

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 231721271 - 2¹⁸ = 231459127 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 231721271.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231721277) 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, 6815315 + ... + 6815348.

It is an arithmetic number, because the mean of its divisors is an integer number (61337988).

Almost surely, 2^231721271 is an apocalyptic number.

231721271 is a deficient number, since it is larger than the sum of its proper divisors (13630681).

231721271 is a wasteful number, since it uses less digits than its factorization.

231721271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13630680.

The product of its digits is 1176, while the sum is 26.

The square root of 231721271 is about 15222.3937342325. The cubic root of 231721271 is about 614.2171907211.

The spelling of 231721271 in words is "two hundred thirty-one million, seven hundred twenty-one thousand, two hundred seventy-one".