123173217 has 20 divisors (see below), whose sum is σ = 184716180. Its totient is φ = 81795744.

The previous prime is 123173209. The next prime is 123173221. The reversal of 123173217 is 712371321.

It can be written as a sum of positive squares in 2 ways, for example, as 47900241 + 75272976 = 6921^2 + 8676^2 .

It is not a de Polignac number, because 123173217 - 2³ = 123173209 is a prime.

It is a super-2 number, since 2×123173217² = 30343282772258178, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (123173227) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 18963 + ... + 24615.

It is an arithmetic number, because the mean of its divisors is an integer number (9235809).

Almost surely, 2^123173217 is an apocalyptic number.

It is an amenable number.

123173217 is a deficient number, since it is larger than the sum of its proper divisors (61542963).

123173217 is an equidigital number, since it uses as much as digits as its factorization.

123173217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5934 (or 5925 counting only the distinct ones).

The product of its digits is 1764, while the sum is 27.

The square root of 123173217 is about 11098.3429844279. The cubic root of 123173217 is about 497.5523266763.

The spelling of 123173217 in words is "one hundred twenty-three million, one hundred seventy-three thousand, two hundred seventeen".