31223013 has 4 divisors (see below), whose sum is σ = 41630688. Its totient is φ = 20815340.

The previous prime is 31222991. The next prime is 31223021. The reversal of 31223013 is 31032213.

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, and also an emirpimes, since its reverse is a distinct semiprime: 31032213 = 3 ⋅10344071.

It is a cyclic number.

It is not a de Polignac number, because 31223013 - 2⁵ = 31222981 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31222983 and 31223001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31223113) 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, 5203833 + ... + 5203838.

It is an arithmetic number, because the mean of its divisors is an integer number (10407672).

Almost surely, 2^31223013 is an apocalyptic number.

It is an amenable number.

31223013 is a deficient number, since it is larger than the sum of its proper divisors (10407675).

31223013 is a wasteful number, since it uses less digits than its factorization.

31223013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10407674.

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 31223013 is about 5587.7556317362. The cubic root of 31223013 is about 314.8895657223.

Adding to 31223013 its reverse (31032213), we get a palindrome (62255226).

The spelling of 31223013 in words is "thirty-one million, two hundred twenty-three thousand, thirteen".