231453221 has 2 divisors, whose sum is σ = 231453222. Its totient is φ = 231453220.

The previous prime is 231453217. The next prime is 231453247. The reversal of 231453221 is 122354132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121308196 + 110145025 = 11014^2 + 10495^2 .

It is a cyclic number.

It is not a de Polignac number, because 231453221 - 2² = 231453217 is a prime.

It is a super-2 number, since 2×231453221² = 107141187022549682, 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 (231453281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115726610 + 115726611.

It is an arithmetic number, because the mean of its divisors is an integer number (115726611).

Almost surely, 2^231453221 is an apocalyptic number.

It is an amenable number.

231453221 is a deficient number, since it is larger than the sum of its proper divisors (1).

231453221 is an equidigital number, since it uses as much as digits as its factorization.

231453221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 23.

The square root of 231453221 is about 15213.5867237151. The cubic root of 231453221 is about 613.9802617555.

The spelling of 231453221 in words is "two hundred thirty-one million, four hundred fifty-three thousand, two hundred twenty-one".