2159381581 has 8 divisors (see below), whose sum is σ = 2471975744. Its totient is φ = 1847815200.

The previous prime is 2159381573. The next prime is 2159381593. The reversal of 2159381581 is 1851839512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2159381581 - 2³ = 2159381573 is a prime.

It is a super-2 number, since 2×2159381581² = 9325857624724119122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2159381501) 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 in 7 ways as a sum of consecutive naturals, for example, 252435 + ... + 260848.

It is an arithmetic number, because the mean of its divisors is an integer number (308996968).

Almost surely, 2^2159381581 is an apocalyptic number.

It is an amenable number.

2159381581 is a deficient number, since it is larger than the sum of its proper divisors (312594163).

2159381581 is an equidigital number, since it uses as much as digits as its factorization.

2159381581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513891.

The product of its digits is 86400, while the sum is 43.

The square root of 2159381581 is about 46469.1465490814. The cubic root of 2159381581 is about 1292.5374371192.

The spelling of 2159381581 in words is "two billion, one hundred fifty-nine million, three hundred eighty-one thousand, five hundred eighty-one".