2171988733 has 2 divisors, whose sum is σ = 2171988734. Its totient is φ = 2171988732.

The previous prime is 2171988719. The next prime is 2171988811. The reversal of 2171988733 is 3378891712.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1925278884 + 246709849 = 43878^2 + 15707^2 .

It is a cyclic number.

It is not a de Polignac number, because 2171988733 - 2²⁹ = 1635117821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2171988703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1085994366 + 1085994367.

It is an arithmetic number, because the mean of its divisors is an integer number (1085994367).

Almost surely, 2^2171988733 is an apocalyptic number.

It is an amenable number.

2171988733 is a deficient number, since it is larger than the sum of its proper divisors (1).

2171988733 is an equidigital number, since it uses as much as digits as its factorization.

2171988733 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 508032, while the sum is 49.

The square root of 2171988733 is about 46604.5999124550. The cubic root of 2171988733 is about 1295.0479716680.

The spelling of 2171988733 in words is "two billion, one hundred seventy-one million, nine hundred eighty-eight thousand, seven hundred thirty-three".