231071999 has 2 divisors, whose sum is σ = 231072000. Its totient is φ = 231071998.

The previous prime is 231071989. The next prime is 231072001. The reversal of 231071999 is 999170132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231071999 - 2⁴ = 231071983 is a prime.

It is a Sophie Germain prime.

Together with 231072001, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231071909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115535999 + 115536000.

It is an arithmetic number, because the mean of its divisors is an integer number (115536000).

Almost surely, 2^231071999 is an apocalyptic number.

231071999 is a deficient number, since it is larger than the sum of its proper divisors (1).

231071999 is an equidigital number, since it uses as much as digits as its factorization.

231071999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30618, while the sum is 41.

The square root of 231071999 is about 15201.0525622406. The cubic root of 231071999 is about 613.6429849518.

The spelling of 231071999 in words is "two hundred thirty-one million, seventy-one thousand, nine hundred ninety-nine".