231281223 has 8 divisors (see below), whose sum is σ = 308692608. Its totient is φ = 154028664.

The previous prime is 231281201. The next prime is 231281231. The reversal of 231281223 is 322182132.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 231281223 - 2²⁰ = 230232647 is a prime.

It is a super-2 number, since 2×231281223² = 106982008224751458, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 231281193 and 231281202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231281233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36265 + ... + 42162.

It is an arithmetic number, because the mean of its divisors is an integer number (38586576).

Almost surely, 2^231281223 is an apocalyptic number.

231281223 is a deficient number, since it is larger than the sum of its proper divisors (77411385).

231281223 is an equidigital number, since it uses as much as digits as its factorization.

231281223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79413.

The product of its digits is 1152, while the sum is 24.

The square root of 231281223 is about 15207.9328970113. The cubic root of 231281223 is about 613.8281366362.

Subtracting 231281223 from its reverse (322182132), we obtain a palindrome (90900909).

The spelling of 231281223 in words is "two hundred thirty-one million, two hundred eighty-one thousand, two hundred twenty-three".