6891213 has 32 divisors (see below), whose sum is σ = 11065600. Its totient is φ = 3810240.

The previous prime is 6891211. The next prime is 6891217. The reversal of 6891213 is 3121986.

It is not a de Polignac number, because 6891213 - 2¹ = 6891211 is a prime.

It is a super-2 number, since 2×6891213² = 94977633222738, which contains 22 as substring.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6891211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37983 + ... + 38163.

It is an arithmetic number, because the mean of its divisors is an integer number (345800).

Almost surely, 2^6891213 is an apocalyptic number.

It is an amenable number.

6891213 is a deficient number, since it is larger than the sum of its proper divisors (4174387).

6891213 is a wasteful number, since it uses less digits than its factorization.

6891213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242 (or 228 counting only the distinct ones).

The product of its digits is 2592, while the sum is 30.

The square root of 6891213 is about 2625.1119976108. Note that the first 3 decimals coincide. The cubic root of 6891213 is about 190.2969778594.

The spelling of 6891213 in words is "six million, eight hundred ninety-one thousand, two hundred thirteen".