131223013 has 4 divisors (see below), whose sum is σ = 134015040. Its totient is φ = 128430988.

The previous prime is 131223011. The next prime is 131223019. The reversal of 131223013 is 310322131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 131223013 - 2¹ = 131223011 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131223011) 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, 1395943 + ... + 1396036.

It is an arithmetic number, because the mean of its divisors is an integer number (33503760).

Almost surely, 2^131223013 is an apocalyptic number.

It is an amenable number.

131223013 is a deficient number, since it is larger than the sum of its proper divisors (2792027).

131223013 is an equidigital number, since it uses as much as digits as its factorization.

131223013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2792026.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 131223013 is about 11455.2613675987. The cubic root of 131223013 is about 508.1633449234.

Adding to 131223013 its reverse (310322131), we get a palindrome (441545144).

The spelling of 131223013 in words is "one hundred thirty-one million, two hundred twenty-three thousand, thirteen".