2159945987 has 8 divisors (see below), whose sum is σ = 2230519680. Its totient is φ = 2089428480.

The previous prime is 2159945981. The next prime is 2159946017. The reversal of 2159945987 is 7895499512.

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

It is a cyclic number.

It is not a de Polignac number, because 2159945987 - 2⁴ = 2159945971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2159945981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72689 + ... + 97997.

It is an arithmetic number, because the mean of its divisors is an integer number (278814960).

Almost surely, 2^2159945987 is an apocalyptic number.

2159945987 is a deficient number, since it is larger than the sum of its proper divisors (70573693).

2159945987 is a wasteful number, since it uses less digits than its factorization.

2159945987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28093.

The product of its digits is 8164800, while the sum is 59.

The square root of 2159945987 is about 46475.2190634966. The cubic root of 2159945987 is about 1292.6500391626.

The spelling of 2159945987 in words is "two billion, one hundred fifty-nine million, nine hundred forty-five thousand, nine hundred eighty-seven".