13431213 has 6 divisors (see below), whose sum is σ = 19400654. Its totient is φ = 8954136.

The previous prime is 13431191. The next prime is 13431217. The reversal of 13431213 is 31213431.

It can be written as a sum of positive squares in only one way, i.e., 12938409 + 492804 = 3597^2 + 702^2 .

It is not a de Polignac number, because 13431213 - 2⁵ = 13431181 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 (13431217) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 746170 + ... + 746187.

Almost surely, 2^13431213 is an apocalyptic number.

It is an amenable number.

13431213 is a deficient number, since it is larger than the sum of its proper divisors (5969441).

13431213 is a wasteful number, since it uses less digits than its factorization.

13431213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1492363 (or 1492360 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 13431213 is about 3664.8619346437. The cubic root of 13431213 is about 237.7050520900.

Adding to 13431213 its reverse (31213431), we get a palindrome (44644644).

It can be divided in two parts, 1343 and 1213, that added together give a triangular number (2556 = T₇₁).

The spelling of 13431213 in words is "thirteen million, four hundred thirty-one thousand, two hundred thirteen".