817255913 has 2 divisors, whose sum is σ = 817255914. Its totient is φ = 817255912.

The previous prime is 817255897. The next prime is 817255927. The reversal of 817255913 is 319552718.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 773006809 + 44249104 = 27803^2 + 6652^2 .

It is a cyclic number.

It is not a de Polignac number, because 817255913 - 2⁴ = 817255897 is a prime.

It is not a weakly prime, because it can be changed into another prime (817255973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408627956 + 408627957.

It is an arithmetic number, because the mean of its divisors is an integer number (408627957).

Almost surely, 2^817255913 is an apocalyptic number.

It is an amenable number.

817255913 is a deficient number, since it is larger than the sum of its proper divisors (1).

817255913 is an equidigital number, since it uses as much as digits as its factorization.

817255913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75600, while the sum is 41.

The square root of 817255913 is about 28587.6881366787. The cubic root of 817255913 is about 934.9449148250.

The spelling of 817255913 in words is "eight hundred seventeen million, two hundred fifty-five thousand, nine hundred thirteen".