231981271 has 2 divisors, whose sum is σ = 231981272. Its totient is φ = 231981270.

The previous prime is 231981227. The next prime is 231981283. The reversal of 231981271 is 172189132.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231981271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231981571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115990635 + 115990636.

It is an arithmetic number, because the mean of its divisors is an integer number (115990636).

Almost surely, 2^231981271 is an apocalyptic number.

231981271 is a deficient number, since it is larger than the sum of its proper divisors (1).

231981271 is an equidigital number, since it uses as much as digits as its factorization.

231981271 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 34.

The square root of 231981271 is about 15230.9313897739. The cubic root of 231981271 is about 614.4468298009.

The spelling of 231981271 in words is "two hundred thirty-one million, nine hundred eighty-one thousand, two hundred seventy-one".