8212890691 has 2 divisors, whose sum is σ = 8212890692. Its totient is φ = 8212890690.

The previous prime is 8212890613. The next prime is 8212890713. The reversal of 8212890691 is 1960982128.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8212890691 - 2⁷ = 8212890563 is a prime.

It is not a weakly prime, because it can be changed into another prime (8212897691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4106445345 + 4106445346.

It is an arithmetic number, because the mean of its divisors is an integer number (4106445346).

Almost surely, 2^8212890691 is an apocalyptic number.

8212890691 is a deficient number, since it is larger than the sum of its proper divisors (1).

8212890691 is an equidigital number, since it uses as much as digits as its factorization.

8212890691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 46.

The square root of 8212890691 is about 90625.0003641379. Note that the first 3 decimals coincide. The cubic root of 8212890691 is about 2017.5858073894.

The spelling of 8212890691 in words is "eight billion, two hundred twelve million, eight hundred ninety thousand, six hundred ninety-one".