2159019581 has 2 divisors, whose sum is σ = 2159019582. Its totient is φ = 2159019580.

The previous prime is 2159019563. The next prime is 2159019623. The reversal of 2159019581 is 1859109512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1995051556 + 163968025 = 44666^2 + 12805^2 .

It is a cyclic number.

It is not a de Polignac number, because 2159019581 - 2⁶ = 2159019517 is a prime.

It is a super-2 number, since 2×2159019581² = 9322731102282831122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2159019481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1079509790 + 1079509791.

It is an arithmetic number, because the mean of its divisors is an integer number (1079509791).

Almost surely, 2^2159019581 is an apocalyptic number.

It is an amenable number.

2159019581 is a deficient number, since it is larger than the sum of its proper divisors (1).

2159019581 is an equidigital number, since it uses as much as digits as its factorization.

2159019581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 41.

The square root of 2159019581 is about 46465.2513282776. The cubic root of 2159019581 is about 1292.4652058370.

The spelling of 2159019581 in words is "two billion, one hundred fifty-nine million, nineteen thousand, five hundred eighty-one".