231021799 has 2 divisors, whose sum is σ = 231021800. Its totient is φ = 231021798.

The previous prime is 231021797. The next prime is 231021851. The reversal of 231021799 is 997120132.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231021799 - 2¹ = 231021797 is a prime.

It is a super-2 number, since 2×231021799² = 106742143226392802, which contains 22 as substring.

Together with 231021797, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231021793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115510899 + 115510900.

It is an arithmetic number, because the mean of its divisors is an integer number (115510900).

Almost surely, 2^231021799 is an apocalyptic number.

231021799 is a deficient number, since it is larger than the sum of its proper divisors (1).

231021799 is an equidigital number, since it uses as much as digits as its factorization.

231021799 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 231021799 is about 15199.4012711028. The cubic root of 231021799 is about 613.5985441007.

The spelling of 231021799 in words is "two hundred thirty-one million, twenty-one thousand, seven hundred ninety-nine".