2158556489 has 2 divisors, whose sum is σ = 2158556490. Its totient is φ = 2158556488.

The previous prime is 2158556473. The next prime is 2158556531. The reversal of 2158556489 is 9846558512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2135179264 + 23377225 = 46208^2 + 4835^2 .

It is a cyclic number.

It is not a de Polignac number, because 2158556489 - 2⁴ = 2158556473 is a prime.

It is a super-2 number, since 2×2158556489² = 9318732232408014242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2158556489.

It is not a weakly prime, because it can be changed into another prime (2158556429) 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, 1079278244 + 1079278245.

It is an arithmetic number, because the mean of its divisors is an integer number (1079278245).

Almost surely, 2^2158556489 is an apocalyptic number.

It is an amenable number.

2158556489 is a deficient number, since it is larger than the sum of its proper divisors (1).

2158556489 is an equidigital number, since it uses as much as digits as its factorization.

2158556489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456000, while the sum is 53.

The square root of 2158556489 is about 46460.2678532959. The cubic root of 2158556489 is about 1292.3727914991.

The spelling of 2158556489 in words is "two billion, one hundred fifty-eight million, five hundred fifty-six thousand, four hundred eighty-nine".