8212891 has 2 divisors, whose sum is σ = 8212892. Its totient is φ = 8212890.

The previous prime is 8212879. The next prime is 8212901. The reversal of 8212891 is 1982128.

It is a happy number.

8212891 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8212891 is a prime.

It is not a weakly prime, because it can be changed into another prime (8212801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4106445 + 4106446.

It is an arithmetic number, because the mean of its divisors is an integer number (4106446).

Almost surely, 2^8212891 is an apocalyptic number.

8212891 is the 1813-rd centered pentagonal number.

8212891 is a deficient number, since it is larger than the sum of its proper divisors (1).

8212891 is an equidigital number, since it uses as much as digits as its factorization.

8212891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 31.

The square root of 8212891 is about 2865.8141949540. The cubic root of 8212891 is about 201.7585832692.

The spelling of 8212891 in words is "eight million, two hundred twelve thousand, eight hundred ninety-one".