2159940181 has 16 divisors (see below), whose sum is σ = 2545844224. Its totient is φ = 1794051504.

The previous prime is 2159940173. The next prime is 2159940191. The reversal of 2159940181 is 1810499512.

It is not a de Polignac number, because 2159940181 - 2³ = 2159940173 is a prime.

It is a super-2 number, since 2×2159940181² = 9330683170996625522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2159940191) 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 15 ways as a sum of consecutive naturals, for example, 9976 + ... + 66478.

It is an arithmetic number, because the mean of its divisors is an integer number (159115264).

Almost surely, 2^2159940181 is an apocalyptic number.

It is an amenable number.

2159940181 is a deficient number, since it is larger than the sum of its proper divisors (385904043).

2159940181 is a wasteful number, since it uses less digits than its factorization.

2159940181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56680.

The product of its (nonzero) digits is 25920, while the sum is 40.

The square root of 2159940181 is about 46475.1566000589. The cubic root of 2159940181 is about 1292.6488809341.

The spelling of 2159940181 in words is "two billion, one hundred fifty-nine million, nine hundred forty thousand, one hundred eighty-one".