817208122 has 48 divisors (see below), whose sum is σ = 1355143608. Its totient is φ = 368271360.

The previous prime is 817208111. The next prime is 817208141. The reversal of 817208122 is 221802718.

It can be written as a sum of positive squares in 12 ways, for example, as 283551921 + 533656201 = 16839^2 + 23101^2 .

It is a super-2 number, since 2×817208122² = 1335658229325533768, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4514872 + ... + 4515052.

Almost surely, 2^817208122 is an apocalyptic number.

817208122 is a deficient number, since it is larger than the sum of its proper divisors (537935486).

817208122 is a wasteful number, since it uses less digits than its factorization.

817208122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371 (or 334 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 817208122 is about 28586.8522576376. The cubic root of 817208122 is about 934.9266900875.

The spelling of 817208122 in words is "eight hundred seventeen million, two hundred eight thousand, one hundred twenty-two".