3691213 has 2 divisors, whose sum is σ = 3691214. Its totient is φ = 3691212.

The previous prime is 3691199. The next prime is 3691223. The reversal of 3691213 is 3121963.

3691213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2244004 + 1447209 = 1498^2 + 1203^2 .

It is a cyclic number.

It is not a de Polignac number, because 3691213 - 2¹³ = 3683021 is a prime.

It is a super-2 number, since 2×3691213² = 27250106822738, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3691223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1845606 + 1845607.

It is an arithmetic number, because the mean of its divisors is an integer number (1845607).

Almost surely, 2^3691213 is an apocalyptic number.

It is an amenable number.

3691213 is a deficient number, since it is larger than the sum of its proper divisors (1).

3691213 is an equidigital number, since it uses as much as digits as its factorization.

3691213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 972, while the sum is 25.

The square root of 3691213 is about 1921.2529765754. The cubic root of 3691213 is about 154.5455017615.

Subtracting from 3691213 its product of digits (972), we obtain a square (3690241 = 1921²).

The spelling of 3691213 in words is "three million, six hundred ninety-one thousand, two hundred thirteen".