31113213 has 8 divisors (see below), whose sum is σ = 43924608. Its totient is φ = 19521984.

The previous prime is 31113211. The next prime is 31113217. The reversal of 31113213 is 31231113.

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

It is not a de Polignac number, because 31113213 - 2¹ = 31113211 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31113192 and 31113201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31113211) 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, 304981 + ... + 305082.

It is an arithmetic number, because the mean of its divisors is an integer number (5490576).

Almost surely, 2^31113213 is an apocalyptic number.

It is an amenable number.

31113213 is a deficient number, since it is larger than the sum of its proper divisors (12811395).

31113213 is a wasteful number, since it uses less digits than its factorization.

31113213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610083.

The product of its digits is 54, while the sum is 15.

The square root of 31113213 is about 5577.9219248749. The cubic root of 31113213 is about 314.5200147677.

Adding to 31113213 its reverse (31231113), we get a palindrome (62344326).

The spelling of 31113213 in words is "thirty-one million, one hundred thirteen thousand, two hundred thirteen".