2155240489 has 2 divisors, whose sum is σ = 2155240490. Its totient is φ = 2155240488.

The previous prime is 2155240487. The next prime is 2155240511. The reversal of 2155240489 is 9840425512.

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., 1489342464 + 665898025 = 38592^2 + 25805^2 .

It is a cyclic number.

It is not a de Polignac number, because 2155240489 - 2¹ = 2155240487 is a prime.

Together with 2155240487, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2155240487) 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, 1077620244 + 1077620245.

It is an arithmetic number, because the mean of its divisors is an integer number (1077620245).

Almost surely, 2^2155240489 is an apocalyptic number.

It is an amenable number.

2155240489 is a deficient number, since it is larger than the sum of its proper divisors (1).

2155240489 is an equidigital number, since it uses as much as digits as its factorization.

2155240489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 115200, while the sum is 40.

The square root of 2155240489 is about 46424.5677308901. The cubic root of 2155240489 is about 1291.7106662075.

The spelling of 2155240489 in words is "two billion, one hundred fifty-five million, two hundred forty thousand, four hundred eighty-nine".