31222013 has 8 divisors (see below), whose sum is σ = 33353208. Its totient is φ = 29123584.

The previous prime is 31221977. The next prime is 31222021. The reversal of 31222013 is 31022213.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2951524 + 28270489 = 1718^2 + 5317^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31222013 - 2¹⁰ = 31220989 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 (31222613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6206 + ... + 10047.

It is an arithmetic number, because the mean of its divisors is an integer number (4169151).

Almost surely, 2^31222013 is an apocalyptic number.

It is an amenable number.

31222013 is a deficient number, since it is larger than the sum of its proper divisors (2131195).

31222013 is a wasteful number, since it uses less digits than its factorization.

31222013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16383.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 31222013 is about 5587.6661496550. Note that the first 3 decimals coincide. The cubic root of 31222013 is about 314.8862039612.

Adding to 31222013 its reverse (31022213), we get a palindrome (62244226).

The spelling of 31222013 in words is "thirty-one million, two hundred twenty-two thousand, thirteen".