8213491 has 16 divisors (see below), whose sum is σ = 10160640. Its totient is φ = 6527520.

The previous prime is 8213479. The next prime is 8213497. The reversal of 8213491 is 1943128.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 8213491 - 2⁵ = 8213459 is a prime.

It is a super-2 number, since 2×8213491² = 134922868814162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8213497) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1206 + ... + 4228.

It is an arithmetic number, because the mean of its divisors is an integer number (635040).

Almost surely, 2^8213491 is an apocalyptic number.

8213491 is a deficient number, since it is larger than the sum of its proper divisors (1947149).

8213491 is a wasteful number, since it uses less digits than its factorization.

8213491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3066.

The product of its digits is 1728, while the sum is 28.

The square root of 8213491 is about 2865.9188753348. The cubic root of 8213491 is about 201.7634963667.

The spelling of 8213491 in words is "eight million, two hundred thirteen thousand, four hundred ninety-one".