817185241 has 2 divisors, whose sum is σ = 817185242. Its totient is φ = 817185240.

The previous prime is 817185233. The next prime is 817185247. The reversal of 817185241 is 142581718.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 814531600 + 2653641 = 28540^2 + 1629^2 .

It is a cyclic number.

It is not a de Polignac number, because 817185241 - 2³ = 817185233 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 817185241.

It is not a weakly prime, because it can be changed into another prime (817185247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408592620 + 408592621.

It is an arithmetic number, because the mean of its divisors is an integer number (408592621).

Almost surely, 2^817185241 is an apocalyptic number.

It is an amenable number.

817185241 is a deficient number, since it is larger than the sum of its proper divisors (1).

817185241 is an equidigital number, since it uses as much as digits as its factorization.

817185241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17920, while the sum is 37.

The square root of 817185241 is about 28586.4520533766. The cubic root of 817185241 is about 934.9179643392.

The spelling of 817185241 in words is "eight hundred seventeen million, one hundred eighty-five thousand, two hundred forty-one".