102171217 has 2 divisors, whose sum is σ = 102171218. Its totient is φ = 102171216.

The previous prime is 102171211. The next prime is 102171229. The reversal of 102171217 is 712171201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66601921 + 35569296 = 8161^2 + 5964^2 .

It is a cyclic number.

It is not a de Polignac number, because 102171217 - 2¹¹ = 102169169 is a prime.

It is a super-2 number, since 2×102171217² = 20877915166522178, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (102171211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51085608 + 51085609.

It is an arithmetic number, because the mean of its divisors is an integer number (51085609).

Almost surely, 2^102171217 is an apocalyptic number.

It is an amenable number.

102171217 is a deficient number, since it is larger than the sum of its proper divisors (1).

102171217 is an equidigital number, since it uses as much as digits as its factorization.

102171217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 196, while the sum is 22.

The square root of 102171217 is about 10107.9778887768. The cubic root of 102171217 is about 467.4941587534.

The spelling of 102171217 in words is "one hundred two million, one hundred seventy-one thousand, two hundred seventeen".