197821033 has 2 divisors, whose sum is σ = 197821034. Its totient is φ = 197821032.

The previous prime is 197821031. The next prime is 197821037. The reversal of 197821033 is 330128791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 190357209 + 7463824 = 13797^2 + 2732^2 .

It is an emirp because it is prime and its reverse (330128791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 197821033 - 2¹ = 197821031 is a prime.

It is a super-2 number, since 2×197821033² = 78266322194374178, which contains 22 as substring.

Together with 197821031, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 197821033.

It is not a weakly prime, because it can be changed into another prime (197821031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98910516 + 98910517.

It is an arithmetic number, because the mean of its divisors is an integer number (98910517).

Almost surely, 2^197821033 is an apocalyptic number.

It is an amenable number.

197821033 is a deficient number, since it is larger than the sum of its proper divisors (1).

197821033 is an equidigital number, since it uses as much as digits as its factorization.

197821033 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 197821033 is about 14064.8865263819. The cubic root of 197821033 is about 582.6720084896.

The spelling of 197821033 in words is "one hundred ninety-seven million, eight hundred twenty-one thousand, thirty-three".