2154240217 has 2 divisors, whose sum is σ = 2154240218. Its totient is φ = 2154240216.

The previous prime is 2154240203. The next prime is 2154240223. The reversal of 2154240217 is 7120424512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1648035216 + 506205001 = 40596^2 + 22499^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2154240217 is a prime.

It is not a weakly prime, because it can be changed into another prime (2154240247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077120108 + 1077120109.

It is an arithmetic number, because the mean of its divisors is an integer number (1077120109).

Almost surely, 2^2154240217 is an apocalyptic number.

It is an amenable number.

2154240217 is a deficient number, since it is larger than the sum of its proper divisors (1).

2154240217 is an equidigital number, since it uses as much as digits as its factorization.

2154240217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 2154240217 is about 46413.7933916201. The cubic root of 2154240217 is about 1291.5108026723.

Adding to 2154240217 its reverse (7120424512), we get a palindrome (9274664729).

The spelling of 2154240217 in words is "two billion, one hundred fifty-four million, two hundred forty thousand, two hundred seventeen".