102197209 has 2 divisors, whose sum is σ = 102197210. Its totient is φ = 102197208.

The previous prime is 102197203. The next prime is 102197233. The reversal of 102197209 is 902791201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98406400 + 3790809 = 9920^2 + 1947^2 .

It is a cyclic number.

It is not a de Polignac number, because 102197209 - 2²¹ = 100100057 is a prime.

It is not a weakly prime, because it can be changed into another prime (102197203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51098604 + 51098605.

It is an arithmetic number, because the mean of its divisors is an integer number (51098605).

Almost surely, 2^102197209 is an apocalyptic number.

It is an amenable number.

102197209 is a deficient number, since it is larger than the sum of its proper divisors (1).

102197209 is an equidigital number, since it uses as much as digits as its factorization.

102197209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 102197209 is about 10109.2635241149. The cubic root of 102197209 is about 467.5337983514.

The spelling of 102197209 in words is "one hundred two million, one hundred ninety-seven thousand, two hundred nine".