131223345 has 32 divisors (see below), whose sum is σ = 231966720. Its totient is φ = 62811840.

The previous prime is 131223317. The next prime is 131223361. The reversal of 131223345 is 543322131.

It is not a de Polignac number, because 131223345 - 2¹⁰ = 131222321 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8002 + ... + 18068.

It is an arithmetic number, because the mean of its divisors is an integer number (7248960).

Almost surely, 2^131223345 is an apocalyptic number.

131223345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

131223345 is a deficient number, since it is larger than the sum of its proper divisors (100743375).

131223345 is a wasteful number, since it uses less digits than its factorization.

131223345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10165.

The product of its digits is 2160, while the sum is 24.

The square root of 131223345 is about 11455.2758587474. The cubic root of 131223345 is about 508.1637734816.

Adding to 131223345 its reverse (543322131), we get a palindrome (674545476).

The spelling of 131223345 in words is "one hundred thirty-one million, two hundred twenty-three thousand, three hundred forty-five".