2161282279 has 4 divisors (see below), whose sum is σ = 2327534776. Its totient is φ = 1995029784.

The previous prime is 2161282261. The next prime is 2161282289. The reversal of 2161282279 is 9722821612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2161282279 - 2⁵ = 2161282247 is a prime.

It is a super-2 number, since 2×2161282279² = 9342282179038867682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161282219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83126229 + ... + 83126254.

It is an arithmetic number, because the mean of its divisors is an integer number (581883694).

Almost surely, 2^2161282279 is an apocalyptic number.

2161282279 is a deficient number, since it is larger than the sum of its proper divisors (166252497).

2161282279 is a wasteful number, since it uses less digits than its factorization.

2161282279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166252496.

The product of its digits is 48384, while the sum is 40.

The square root of 2161282279 is about 46489.5932333248. The cubic root of 2161282279 is about 1292.9165584518.

The spelling of 2161282279 in words is "two billion, one hundred sixty-one million, two hundred eighty-two thousand, two hundred seventy-nine".