2173724489 has 2 divisors, whose sum is σ = 2173724490. Its totient is φ = 2173724488.

The previous prime is 2173724467. The next prime is 2173724603. The reversal of 2173724489 is 9844273712.

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., 1205270089 + 968454400 = 34717^2 + 31120^2 .

It is a cyclic number.

It is not a de Polignac number, because 2173724489 - 2⁸ = 2173724233 is a prime.

It is a super-2 number, since 2×2173724489² = 9450156308156622242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2173714489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1086862244 + 1086862245.

It is an arithmetic number, because the mean of its divisors is an integer number (1086862245).

Almost surely, 2^2173724489 is an apocalyptic number.

It is an amenable number.

2173724489 is a deficient number, since it is larger than the sum of its proper divisors (1).

2173724489 is an equidigital number, since it uses as much as digits as its factorization.

2173724489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 677376, while the sum is 47.

The square root of 2173724489 is about 46623.2183466564. The cubic root of 2173724489 is about 1295.3928612332.

The spelling of 2173724489 in words is "two billion, one hundred seventy-three million, seven hundred twenty-four thousand, four hundred eighty-nine".