231321019 has 2 divisors, whose sum is σ = 231321020. Its totient is φ = 231321018.

The previous prime is 231321001. The next prime is 231321043. The reversal of 231321019 is 910123132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231321019 - 2⁷ = 231320891 is a prime.

It is a super-2 number, since 2×231321019² = 107018827662396722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (231321049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115660509 + 115660510.

It is an arithmetic number, because the mean of its divisors is an integer number (115660510).

Almost surely, 2^231321019 is an apocalyptic number.

231321019 is a deficient number, since it is larger than the sum of its proper divisors (1).

231321019 is an equidigital number, since it uses as much as digits as its factorization.

231321019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 231321019 is about 15209.2412368270. The cubic root of 231321019 is about 613.8633412574.

It can be divided in two parts, 2313 and 21019, that added together give a palindrome (23332).

The spelling of 231321019 in words is "two hundred thirty-one million, three hundred twenty-one thousand, nineteen".