809019929 has 2 divisors, whose sum is σ = 809019930. Its totient is φ = 809019928.

The previous prime is 809019907. The next prime is 809019941. The reversal of 809019929 is 929910908.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 622752025 + 186267904 = 24955^2 + 13648^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-809019929 is a prime.

It is not a weakly prime, because it can be changed into another prime (809019979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404509964 + 404509965.

It is an arithmetic number, because the mean of its divisors is an integer number (404509965).

Almost surely, 2^809019929 is an apocalyptic number.

It is an amenable number.

809019929 is a deficient number, since it is larger than the sum of its proper divisors (1).

809019929 is an equidigital number, since it uses as much as digits as its factorization.

809019929 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104976, while the sum is 47.

The square root of 809019929 is about 28443.2756376617. The cubic root of 809019929 is about 931.7936360413.

The spelling of 809019929 in words is "eight hundred nine million, nineteen thousand, nine hundred twenty-nine".