97198109 has 2 divisors, whose sum is σ = 97198110. Its totient is φ = 97198108.

The previous prime is 97198093. The next prime is 97198121. The reversal of 97198109 is 90189179.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62647225 + 34550884 = 7915^2 + 5878^2 .

It is a cyclic number.

It is not a de Polignac number, because 97198109 - 2⁴ = 97198093 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 97198109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97188109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48599054 + 48599055.

It is an arithmetic number, because the mean of its divisors is an integer number (48599055).

Almost surely, 2^97198109 is an apocalyptic number.

It is an amenable number.

97198109 is a deficient number, since it is larger than the sum of its proper divisors (1).

97198109 is an equidigital number, since it uses as much as digits as its factorization.

97198109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 44.

The square root of 97198109 is about 9858.9101324639. The cubic root of 97198109 is about 459.7826777478.

The spelling of 97198109 in words is "ninety-seven million, one hundred ninety-eight thousand, one hundred nine".