8219251 has 4 divisors (see below), whose sum is σ = 8225104. Its totient is φ = 8213400.

The previous prime is 8219243. The next prime is 8219269. The reversal of 8219251 is 1529128.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a 3-Lehmer number, since φ(8219251) divides (8219251-1)³.

It is a cyclic number.

It is not a de Polignac number, because 8219251 - 2³ = 8219243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8219221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 586 + ... + 4096.

It is an arithmetic number, because the mean of its divisors is an integer number (2056276).

Almost surely, 2^8219251 is an apocalyptic number.

8219251 is the 2341-st pentagonal number.

8219251 is a deficient number, since it is larger than the sum of its proper divisors (5853).

8219251 is a wasteful number, since it uses less digits than its factorization.

8219251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5852.

The product of its digits is 1440, while the sum is 28.

The square root of 8219251 is about 2866.9236125157. The cubic root of 8219251 is about 201.8106499330.

The spelling of 8219251 in words is "eight million, two hundred nineteen thousand, two hundred fifty-one".