345223231 has 4 divisors (see below), whose sum is σ = 345272200. Its totient is φ = 345174264.

The previous prime is 345223213. The next prime is 345223237. The reversal of 345223231 is 132322543.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 345223231 - 2¹⁹ = 344698943 is a prime.

It is a super-2 number, since 2×345223231² = 238358158444158722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 345223196 and 345223205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (345223237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11676 + ... + 28753.

It is an arithmetic number, because the mean of its divisors is an integer number (86318050).

Almost surely, 2^345223231 is an apocalyptic number.

345223231 is a deficient number, since it is larger than the sum of its proper divisors (48969).

345223231 is an equidigital number, since it uses as much as digits as its factorization.

345223231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48968.

The product of its digits is 4320, while the sum is 25.

The square root of 345223231 is about 18580.1838257860. The cubic root of 345223231 is about 701.5091460999.

Adding to 345223231 its reverse (132322543), we get a palindrome (477545774).

The spelling of 345223231 in words is "three hundred forty-five million, two hundred twenty-three thousand, two hundred thirty-one".