102818197 has 2 divisors, whose sum is σ = 102818198. Its totient is φ = 102818196.

The previous prime is 102818189. The next prime is 102818207. The reversal of 102818197 is 791818201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97101316 + 5716881 = 9854^2 + 2391^2 .

It is a cyclic number.

It is not a de Polignac number, because 102818197 - 2³ = 102818189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102818147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51409098 + 51409099.

It is an arithmetic number, because the mean of its divisors is an integer number (51409099).

Almost surely, 2^102818197 is an apocalyptic number.

It is an amenable number.

102818197 is a deficient number, since it is larger than the sum of its proper divisors (1).

102818197 is an equidigital number, since it uses as much as digits as its factorization.

102818197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 37.

The square root of 102818197 is about 10139.9308183044. The cubic root of 102818197 is about 468.4788561201.

The spelling of 102818197 in words is "one hundred two million, eight hundred eighteen thousand, one hundred ninety-seven".