817145911 has 2 divisors, whose sum is σ = 817145912. Its totient is φ = 817145910.

The previous prime is 817145843. The next prime is 817145983. The reversal of 817145911 is 119541718.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-817145911 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (817145011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408572955 + 408572956.

It is an arithmetic number, because the mean of its divisors is an integer number (408572956).

Almost surely, 2^817145911 is an apocalyptic number.

817145911 is a deficient number, since it is larger than the sum of its proper divisors (1).

817145911 is an equidigital number, since it uses as much as digits as its factorization.

817145911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 37.

The square root of 817145911 is about 28585.7641318192. The cubic root of 817145911 is about 934.9029653273.

The spelling of 817145911 in words is "eight hundred seventeen million, one hundred forty-five thousand, nine hundred eleven".