3131213 has 4 divisors (see below), whose sum is σ = 3315420. Its totient is φ = 2947008.

The previous prime is 3131209. The next prime is 3131221. The reversal of 3131213 is 3121313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3121313 = 13 ⋅240101.

It can be written as a sum of positive squares in 2 ways, for example, as 2184484 + 946729 = 1478^2 + 973^2 .

It is a cyclic number.

It is not a de Polignac number, because 3131213 - 2² = 3131209 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 (3131203) 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, 92078 + ... + 92111.

It is an arithmetic number, because the mean of its divisors is an integer number (828855).

Almost surely, 2^3131213 is an apocalyptic number.

It is an amenable number.

3131213 is a deficient number, since it is larger than the sum of its proper divisors (184207).

3131213 is a wasteful number, since it uses less digits than its factorization.

3131213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184206.

The product of its digits is 54, while the sum is 14.

The square root of 3131213 is about 1769.5233821569. The cubic root of 3131213 is about 146.2977130221.

Adding to 3131213 its reverse (3121313), we get a palindrome (6252526).

The spelling of 3131213 in words is "three million, one hundred thirty-one thousand, two hundred thirteen".