8557213 has 6 divisors (see below), whose sum is σ = 9954366. Its totient is φ = 7334712.

The previous prime is 8557207. The next prime is 8557223. The reversal of 8557213 is 3127558.

It can be written as a sum of positive squares in only one way, i.e., 8076964 + 480249 = 2842^2 + 693^2 .

It is not a de Polignac number, because 8557213 - 2⁵ = 8557181 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 (8557223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 87270 + ... + 87367.

It is an arithmetic number, because the mean of its divisors is an integer number (1659061).

Almost surely, 2^8557213 is an apocalyptic number.

It is an amenable number.

8557213 is a deficient number, since it is larger than the sum of its proper divisors (1397153).

8557213 is a wasteful number, since it uses less digits than its factorization.

8557213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174651 (or 174644 counting only the distinct ones).

The product of its digits is 8400, while the sum is 31.

The square root of 8557213 is about 2925.2714403966. The cubic root of 8557213 is about 204.5396212508.

The spelling of 8557213 in words is "eight million, five hundred fifty-seven thousand, two hundred thirteen".