805981667 has 2 divisors, whose sum is σ = 805981668. Its totient is φ = 805981666.

The previous prime is 805981613. The next prime is 805981681. The reversal of 805981667 is 766189508.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 805981667 - 2²⁶ = 738872803 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (805981367) by changing a digit.

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 as a sum of consecutive naturals, namely, 402990833 + 402990834.

It is an arithmetic number, because the mean of its divisors is an integer number (402990834).

Almost surely, 2^805981667 is an apocalyptic number.

805981667 is a deficient number, since it is larger than the sum of its proper divisors (1).

805981667 is an equidigital number, since it uses as much as digits as its factorization.

805981667 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 725760, while the sum is 50.

The square root of 805981667 is about 28389.8162551292. The cubic root of 805981667 is about 930.6257272030.

The spelling of 805981667 in words is "eight hundred five million, nine hundred eighty-one thousand, six hundred sixty-seven".