1997633333 has 2 divisors, whose sum is σ = 1997633334. Its totient is φ = 1997633332.

The previous prime is 1997633311. The next prime is 1997633347. The reversal of 1997633333 is 3333367991.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1794200164 + 203433169 = 42358^2 + 14263^2 .

It is an emirp because it is prime and its reverse (3333367991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1997633333 - 2¹⁰ = 1997632309 is a prime.

It is a super-2 number, since 2×1997633333² = 7981077866225377778, which contains 22 as substring.

1997633333 is a modest number, since divided by 33333 gives 19976 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1997633353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 998816666 + 998816667.

It is an arithmetic number, because the mean of its divisors is an integer number (998816667).

Almost surely, 2^1997633333 is an apocalyptic number.

It is an amenable number.

1997633333 is a deficient number, since it is larger than the sum of its proper divisors (1).

1997633333 is an equidigital number, since it uses as much as digits as its factorization.

1997633333 is an evil number, because the sum of its binary digits is even.

The product of its digits is 826686, while the sum is 47.

The square root of 1997633333 is about 44694.8915761074. The cubic root of 1997633333 is about 1259.4238848107.

The spelling of 1997633333 in words is "one billion, nine hundred ninety-seven million, six hundred thirty-three thousand, three hundred thirty-three".