809298643 has 2 divisors, whose sum is σ = 809298644. Its totient is φ = 809298642.

The previous prime is 809298619. The next prime is 809298647. The reversal of 809298643 is 346892908.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 809298643 - 2¹³ = 809290451 is a prime.

It is not a weakly prime, because it can be changed into another prime (809298647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404649321 + 404649322.

It is an arithmetic number, because the mean of its divisors is an integer number (404649322).

Almost surely, 2^809298643 is an apocalyptic number.

809298643 is a deficient number, since it is larger than the sum of its proper divisors (1).

809298643 is an equidigital number, since it uses as much as digits as its factorization.

809298643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 746496, while the sum is 49.

The square root of 809298643 is about 28448.1746866121. The cubic root of 809298643 is about 931.9006272720.

The spelling of 809298643 in words is "eight hundred nine million, two hundred ninety-eight thousand, six hundred forty-three".