102197309 has 2 divisors, whose sum is σ = 102197310. Its totient is φ = 102197308.

The previous prime is 102197267. The next prime is 102197351. The reversal of 102197309 is 903791201.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (102197267) and next prime (102197351).

It can be written as a sum of positive squares in only one way, i.e., 95452900 + 6744409 = 9770^2 + 2597^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102197309 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102197209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51098654 + 51098655.

It is an arithmetic number, because the mean of its divisors is an integer number (51098655).

Almost surely, 2^102197309 is an apocalyptic number.

It is an amenable number.

102197309 is a deficient number, since it is larger than the sum of its proper divisors (1).

102197309 is an equidigital number, since it uses as much as digits as its factorization.

102197309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3402, while the sum is 32.

The square root of 102197309 is about 10109.2684700724. The cubic root of 102197309 is about 467.5339508454.

The spelling of 102197309 in words is "one hundred two million, one hundred ninety-seven thousand, three hundred nine".