6691213 has 4 divisors (see below), whose sum is σ = 6703200. Its totient is φ = 6679228.

The previous prime is 6691207. The next prime is 6691219. The reversal of 6691213 is 3121966.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (6691207) and next prime (6691219).

It is a cyclic number.

It is not a de Polignac number, because 6691213 - 2⁹ = 6690701 is a prime.

It is a super-2 number, since 2×6691213² = 89544662822738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6691219) 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 in 3 ways as a sum of consecutive naturals, for example, 5113 + ... + 6286.

It is an arithmetic number, because the mean of its divisors is an integer number (1675800).

Almost surely, 2^6691213 is an apocalyptic number.

It is an amenable number.

6691213 is a deficient number, since it is larger than the sum of its proper divisors (11987).

6691213 is a wasteful number, since it uses less digits than its factorization.

6691213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11986.

The product of its digits is 1944, while the sum is 28.

The square root of 6691213 is about 2586.7379070946. The cubic root of 6691213 is about 188.4379126974.

It can be divided in two parts, 669121 and 3, that added together give a square (669124 = 818²).

The spelling of 6691213 in words is "six million, six hundred ninety-one thousand, two hundred thirteen".