80905807 has 2 divisors, whose sum is σ = 80905808. Its totient is φ = 80905806.

The previous prime is 80905787. The next prime is 80905813. The reversal of 80905807 is 70850908.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80905807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80905817) 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, 40452903 + 40452904.

It is an arithmetic number, because the mean of its divisors is an integer number (40452904).

Almost surely, 2^80905807 is an apocalyptic number.

80905807 is a deficient number, since it is larger than the sum of its proper divisors (1).

80905807 is an equidigital number, since it uses as much as digits as its factorization.

80905807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 80905807 is about 8994.7655333533. The cubic root of 80905807 is about 432.5070902198.

The spelling of 80905807 in words is "eighty million, nine hundred five thousand, eight hundred seven".