108217861897 has 2 divisors, whose sum is σ = 108217861898. Its totient is φ = 108217861896.

The previous prime is 108217861837. The next prime is 108217861907. The reversal of 108217861897 is 798168712801.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102156305161 + 6061556736 = 319619^2 + 77856^2 .

It is a cyclic number.

It is not a de Polignac number, because 108217861897 - 2⁷ = 108217861769 is a prime.

It is a super-2 number, since 2×108217861897² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (108217861837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54108930948 + 54108930949.

It is an arithmetic number, because the mean of its divisors is an integer number (54108930949).

Almost surely, 2^108217861897 is an apocalyptic number.

It is an amenable number.

108217861897 is a deficient number, since it is larger than the sum of its proper divisors (1).

108217861897 is an equidigital number, since it uses as much as digits as its factorization.

108217861897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2709504, while the sum is 58.

The spelling of 108217861897 in words is "one hundred eight billion, two hundred seventeen million, eight hundred sixty-one thousand, eight hundred ninety-seven".