197621833 has 2 divisors, whose sum is σ = 197621834. Its totient is φ = 197621832.

The previous prime is 197621797. The next prime is 197621839. The reversal of 197621833 is 338126791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 126607504 + 71014329 = 11252^2 + 8427^2 .

It is an emirp because it is prime and its reverse (338126791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 197621833 - 2¹³ = 197613641 is a prime.

It is not a weakly prime, because it can be changed into another prime (197621839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98810916 + 98810917.

It is an arithmetic number, because the mean of its divisors is an integer number (98810917).

Almost surely, 2^197621833 is an apocalyptic number.

It is an amenable number.

197621833 is a deficient number, since it is larger than the sum of its proper divisors (1).

197621833 is an equidigital number, since it uses as much as digits as its factorization.

197621833 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 40.

The square root of 197621833 is about 14057.8032778952. The cubic root of 197621833 is about 582.4763649101.

The spelling of 197621833 in words is "one hundred ninety-seven million, six hundred twenty-one thousand, eight hundred thirty-three".