231223019 has 2 divisors, whose sum is σ = 231223020. Its totient is φ = 231223018.

The previous prime is 231222923. The next prime is 231223021. The reversal of 231223019 is 910322132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231223019 - 2²⁰ = 230174443 is a prime.

It is a super-2 number, since 2×231223019² = 106928169030948722, which contains 22 as substring.

Together with 231223021, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 231222985 and 231223003.

It is not a weakly prime, because it can be changed into another prime (231223039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115611509 + 115611510.

It is an arithmetic number, because the mean of its divisors is an integer number (115611510).

Almost surely, 2^231223019 is an apocalyptic number.

231223019 is a deficient number, since it is larger than the sum of its proper divisors (1).

231223019 is an equidigital number, since it uses as much as digits as its factorization.

231223019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 231223019 is about 15206.0191700524. The cubic root of 231223019 is about 613.7766405256.

The spelling of 231223019 in words is "two hundred thirty-one million, two hundred twenty-three thousand, nineteen".