1097808197 has 2 divisors, whose sum is σ = 1097808198. Its totient is φ = 1097808196.

The previous prime is 1097808191. The next prime is 1097808209. The reversal of 1097808197 is 7918087901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 976500001 + 121308196 = 31249^2 + 11014^2 .

It is an emirp because it is prime and its reverse (7918087901) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1097808197 - 2²⁸ = 829372741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1097808191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 548904098 + 548904099.

It is an arithmetic number, because the mean of its divisors is an integer number (548904099).

Almost surely, 2^1097808197 is an apocalyptic number.

It is an amenable number.

1097808197 is a deficient number, since it is larger than the sum of its proper divisors (1).

1097808197 is an equidigital number, since it uses as much as digits as its factorization.

1097808197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 254016, while the sum is 50.

The square root of 1097808197 is about 33133.1887538764. The cubic root of 1097808197 is about 1031.5940369505.

The spelling of 1097808197 in words is "one billion, ninety-seven million, eight hundred eight thousand, one hundred ninety-seven".