2161279982 has 16 divisors (see below), whose sum is σ = 3430425600. Its totient is φ = 1018400760.

The previous prime is 2161279957. The next prime is 2161279987. The reversal of 2161279982 is 2899721612.

It is a super-2 number, since 2×2161279982² = 9342262321187840648, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161279987) 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, 141632 + ... + 156147.

It is an arithmetic number, because the mean of its divisors is an integer number (214401600).

Almost surely, 2^2161279982 is an apocalyptic number.

2161279982 is a deficient number, since it is larger than the sum of its proper divisors (1269145618).

2161279982 is a wasteful number, since it uses less digits than its factorization.

2161279982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297991.

The product of its digits is 217728, while the sum is 47.

The square root of 2161279982 is about 46489.5685288646. The cubic root of 2161279982 is about 1292.9161004165.

The spelling of 2161279982 in words is "two billion, one hundred sixty-one million, two hundred seventy-nine thousand, nine hundred eighty-two".