802116509 has 2 divisors, whose sum is σ = 802116510. Its totient is φ = 802116508.

The previous prime is 802116493. The next prime is 802116529. The reversal of 802116509 is 905611208.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 694164409 + 107952100 = 26347^2 + 10390^2 .

It is a cyclic number.

It is not a de Polignac number, because 802116509 - 2⁴ = 802116493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (802116529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 401058254 + 401058255.

It is an arithmetic number, because the mean of its divisors is an integer number (401058255).

Almost surely, 2^802116509 is an apocalyptic number.

It is an amenable number.

802116509 is a deficient number, since it is larger than the sum of its proper divisors (1).

802116509 is an equidigital number, since it uses as much as digits as its factorization.

802116509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 802116509 is about 28321.6614802169. The cubic root of 802116509 is about 929.1357095314.

The spelling of 802116509 in words is "eight hundred two million, one hundred sixteen thousand, five hundred nine".