8212991 has 2 divisors, whose sum is σ = 8212992. Its totient is φ = 8212990.

The previous prime is 8212987. The next prime is 8213033. The reversal of 8212991 is 1992128.

It is a happy number.

8212991 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8212991 - 2² = 8212987 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8212901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4106495 + 4106496.

It is an arithmetic number, because the mean of its divisors is an integer number (4106496).

Almost surely, 2^8212991 is an apocalyptic number.

8212991 is a deficient number, since it is larger than the sum of its proper divisors (1).

8212991 is an equidigital number, since it uses as much as digits as its factorization.

8212991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 32.

The square root of 8212991 is about 2865.8316419497. The cubic root of 8212991 is about 201.7594021354.

The spelling of 8212991 in words is "eight million, two hundred twelve thousand, nine hundred ninety-one".