2154005989 has 2 divisors, whose sum is σ = 2154005990. Its totient is φ = 2154005988.

The previous prime is 2154005983. The next prime is 2154006011. The reversal of 2154005989 is 9895004512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2055896964 + 98109025 = 45342^2 + 9905^2 .

It is a cyclic number.

It is not a de Polignac number, because 2154005989 - 2¹¹ = 2154003941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2154005983) 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, 1077002994 + 1077002995.

It is an arithmetic number, because the mean of its divisors is an integer number (1077002995).

Almost surely, 2^2154005989 is an apocalyptic number.

It is an amenable number.

2154005989 is a deficient number, since it is larger than the sum of its proper divisors (1).

2154005989 is an equidigital number, since it uses as much as digits as its factorization.

2154005989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129600, while the sum is 43.

The square root of 2154005989 is about 46411.2700645005. The cubic root of 2154005989 is about 1291.4639928266.

The spelling of 2154005989 in words is "two billion, one hundred fifty-four million, five thousand, nine hundred eighty-nine".