809098847 has 4 divisors (see below), whose sum is σ = 815004816. Its totient is φ = 803192880.

The previous prime is 809098841. The next prime is 809098861. The reversal of 809098847 is 748890908.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-809098847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809098841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2952779 + ... + 2953052.

It is an arithmetic number, because the mean of its divisors is an integer number (203751204).

Almost surely, 2^809098847 is an apocalyptic number.

809098847 is a deficient number, since it is larger than the sum of its proper divisors (5905969).

809098847 is a wasteful number, since it uses less digits than its factorization.

809098847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5905968.

The product of its (nonzero) digits is 1161216, while the sum is 53.

The square root of 809098847 is about 28444.6628913053. The cubic root of 809098847 is about 931.8239331520.

The spelling of 809098847 in words is "eight hundred nine million, ninety-eight thousand, eight hundred forty-seven".