31043213 has 4 divisors (see below), whose sum is σ = 31628988. Its totient is φ = 30457440.

The previous prime is 31043209. The next prime is 31043219. The reversal of 31043213 is 31234013.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 27646564 + 3396649 = 5258^2 + 1843^2 .

It is a cyclic number.

It is not a de Polignac number, because 31043213 - 2² = 31043209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31043191 and 31043200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31043219) 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, 292808 + ... + 292913.

It is an arithmetic number, because the mean of its divisors is an integer number (7907247).

Almost surely, 2^31043213 is an apocalyptic number.

It is an amenable number.

31043213 is a deficient number, since it is larger than the sum of its proper divisors (585775).

31043213 is an equidigital number, since it uses as much as digits as its factorization.

31043213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 585774.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 31043213 is about 5571.6436533576. The cubic root of 31043213 is about 314.2839635774.

Adding to 31043213 its reverse (31234013), we get a palindrome (62277226).

The spelling of 31043213 in words is "thirty-one million, forty-three thousand, two hundred thirteen".