231221719 has 2 divisors, whose sum is σ = 231221720. Its totient is φ = 231221718.

The previous prime is 231221701. The next prime is 231221723. The reversal of 231221719 is 917122132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231221719 - 2¹¹ = 231219671 is a prime.

It is a super-2 number, since 2×231221719² = 106926966674629922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231221119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115610859 + 115610860.

It is an arithmetic number, because the mean of its divisors is an integer number (115610860).

Almost surely, 2^231221719 is an apocalyptic number.

231221719 is a deficient number, since it is larger than the sum of its proper divisors (1).

231221719 is an equidigital number, since it uses as much as digits as its factorization.

231221719 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 28.

The square root of 231221719 is about 15205.9764237618. The cubic root of 231221719 is about 613.7754902492.

The spelling of 231221719 in words is "two hundred thirty-one million, two hundred twenty-one thousand, seven hundred nineteen".