817252231 has 2 divisors, whose sum is σ = 817252232. Its totient is φ = 817252230.

The previous prime is 817252229. The next prime is 817252259. The reversal of 817252231 is 132252718.

817252231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 817252231 - 2¹ = 817252229 is a prime.

It is a super-2 number, since 2×817252231² = 1335802418148954722, which contains 22 as substring.

Together with 817252229, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 817252193 and 817252202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (817252291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408626115 + 408626116.

It is an arithmetic number, because the mean of its divisors is an integer number (408626116).

Almost surely, 2^817252231 is an apocalyptic number.

817252231 is a deficient number, since it is larger than the sum of its proper divisors (1).

817252231 is an equidigital number, since it uses as much as digits as its factorization.

817252231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6720, while the sum is 31.

The square root of 817252231 is about 28587.6237382543. The cubic root of 817252231 is about 934.9435107474.

The spelling of 817252231 in words is "eight hundred seventeen million, two hundred fifty-two thousand, two hundred thirty-one".