2172242489 has 2 divisors, whose sum is σ = 2172242490. Its totient is φ = 2172242488.

The previous prime is 2172242467. The next prime is 2172242543. The reversal of 2172242489 is 9842422712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2170814464 + 1428025 = 46592^2 + 1195^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2172242489 is a prime.

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 (2172242459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1086121244 + 1086121245.

It is an arithmetic number, because the mean of its divisors is an integer number (1086121245).

Almost surely, 2^2172242489 is an apocalyptic number.

It is an amenable number.

2172242489 is a deficient number, since it is larger than the sum of its proper divisors (1).

2172242489 is an equidigital number, since it uses as much as digits as its factorization.

2172242489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129024, while the sum is 41.

The square root of 2172242489 is about 46607.3222680729. The cubic root of 2172242489 is about 1295.0984036969.

The spelling of 2172242489 in words is "two billion, one hundred seventy-two million, two hundred forty-two thousand, four hundred eighty-nine".