31320213 has 8 divisors (see below), whose sum is σ = 41887776. Its totient is φ = 20816400.

The previous prime is 31320193. The next prime is 31320217. The reversal of 31320213 is 31202313.

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

It is not a de Polignac number, because 31320213 - 2⁸ = 31319957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31320192 and 31320201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31320217) 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, 14778 + ... + 16763.

It is an arithmetic number, because the mean of its divisors is an integer number (5235972).

Almost surely, 2^31320213 is an apocalyptic number.

It is an amenable number.

31320213 is a deficient number, since it is larger than the sum of its proper divisors (10567563).

31320213 is a wasteful number, since it uses less digits than its factorization.

31320213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31875.

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

The square root of 31320213 is about 5596.4464618184. The cubic root of 31320213 is about 315.2159869164.

Adding to 31320213 its reverse (31202313), we get a palindrome (62522526).

The spelling of 31320213 in words is "thirty-one million, three hundred twenty thousand, two hundred thirteen".