6216991 has 8 divisors (see below), whose sum is σ = 7016400. Its totient is φ = 5456640.

The previous prime is 6216989. The next prime is 6217027. The reversal of 6216991 is 1996126.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6216991 - 2¹ = 6216989 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 (6216961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9426 + ... + 10063.

It is an arithmetic number, because the mean of its divisors is an integer number (877050).

Almost surely, 2^6216991 is an apocalyptic number.

6216991 is a deficient number, since it is larger than the sum of its proper divisors (799409).

6216991 is a wasteful number, since it uses less digits than its factorization.

6216991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19529.

The product of its digits is 5832, while the sum is 34.

The square root of 6216991 is about 2493.3894601526. The cubic root of 6216991 is about 183.8767191683.

The spelling of 6216991 in words is "six million, two hundred sixteen thousand, nine hundred ninety-one".