13691213 has 2 divisors, whose sum is σ = 13691214. Its totient is φ = 13691212.

The previous prime is 13691207. The next prime is 13691269. The reversal of 13691213 is 31219631.

13691213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13380964 + 310249 = 3658^2 + 557^2 .

It is a cyclic number.

It is not a de Polignac number, because 13691213 - 2⁶ = 13691149 is a prime.

It is a super-2 number, since 2×13691213² = 374898626822738, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13691113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6845606 + 6845607.

It is an arithmetic number, because the mean of its divisors is an integer number (6845607).

Almost surely, 2^13691213 is an apocalyptic number.

It is an amenable number.

13691213 is a deficient number, since it is larger than the sum of its proper divisors (1).

13691213 is an equidigital number, since it uses as much as digits as its factorization.

13691213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 972, while the sum is 26.

The square root of 13691213 is about 3700.1639152881. The cubic root of 13691213 is about 239.2290830605.

The spelling of 13691213 in words is "thirteen million, six hundred ninety-one thousand, two hundred thirteen".