8213155 has 4 divisors (see below), whose sum is σ = 9855792. Its totient is φ = 6570520.

The previous prime is 8213147. The next prime is 8213167. The reversal of 8213155 is 5513128.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 8213155 - 2³ = 8213147 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 821311 + ... + 821320.

It is an arithmetic number, because the mean of its divisors is an integer number (2463948).

Almost surely, 2^8213155 is an apocalyptic number.

8213155 is a deficient number, since it is larger than the sum of its proper divisors (1642637).

8213155 is a wasteful number, since it uses less digits than its factorization.

8213155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1642636.

The product of its digits is 1200, while the sum is 25.

The square root of 8213155 is about 2865.8602547926. The cubic root of 8213155 is about 201.7607450616.

The spelling of 8213155 in words is "eight million, two hundred thirteen thousand, one hundred fifty-five".