817231117 has 2 divisors, whose sum is σ = 817231118. Its totient is φ = 817231116.

The previous prime is 817231073. The next prime is 817231141. The reversal of 817231117 is 711132718.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 776513956 + 40717161 = 27866^2 + 6381^2 .

It is a cyclic number.

It is not a de Polignac number, because 817231117 - 2⁷ = 817230989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (817231417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408615558 + 408615559.

It is an arithmetic number, because the mean of its divisors is an integer number (408615559).

Almost surely, 2^817231117 is an apocalyptic number.

It is an amenable number.

817231117 is a deficient number, since it is larger than the sum of its proper divisors (1).

817231117 is an equidigital number, since it uses as much as digits as its factorization.

817231117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2352, while the sum is 31.

The square root of 817231117 is about 28587.2544501916. The cubic root of 817231117 is about 934.9354591461.

The spelling of 817231117 in words is "eight hundred seventeen million, two hundred thirty-one thousand, one hundred seventeen".