18820097 has 2 divisors, whose sum is σ = 18820098. Its totient is φ = 18820096.

The previous prime is 18820079. The next prime is 18820103. The reversal of 18820097 is 79002881.

It is a happy number.

Together with previous prime (18820079) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18181696 + 638401 = 4264^2 + 799^2 .

It is a cyclic number.

It is not a de Polignac number, because 18820097 - 2⁸ = 18819841 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18820297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9410048 + 9410049.

It is an arithmetic number, because the mean of its divisors is an integer number (9410049).

Almost surely, 2^18820097 is an apocalyptic number.

It is an amenable number.

18820097 is a deficient number, since it is larger than the sum of its proper divisors (1).

18820097 is an equidigital number, since it uses as much as digits as its factorization.

18820097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 18820097 is about 4338.2135724282. The cubic root of 18820097 is about 265.9952936021.

The spelling of 18820097 in words is "eighteen million, eight hundred twenty thousand, ninety-seven".