197290081 has 2 divisors, whose sum is σ = 197290082. Its totient is φ = 197290080.

The previous prime is 197290057. The next prime is 197290123. The reversal of 197290081 is 180092791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 156125025 + 41165056 = 12495^2 + 6416^2 .

It is an emirp because it is prime and its reverse (180092791) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197290081 is a prime.

It is a super-2 number, since 2×197290081² = 77846752121973122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 197290081.

It is not a weakly prime, because it can be changed into another prime (197290781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98645040 + 98645041.

It is an arithmetic number, because the mean of its divisors is an integer number (98645041).

Almost surely, 2^197290081 is an apocalyptic number.

It is an amenable number.

197290081 is a deficient number, since it is larger than the sum of its proper divisors (1).

197290081 is an equidigital number, since it uses as much as digits as its factorization.

197290081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 197290081 is about 14045.9987540936. The cubic root of 197290081 is about 582.1502438404.

The spelling of 197290081 in words is "one hundred ninety-seven million, two hundred ninety thousand, eighty-one".