2172650881 has 4 divisors (see below), whose sum is σ = 2300453892. Its totient is φ = 2044847872.

The previous prime is 2172650873. The next prime is 2172650891. The reversal of 2172650881 is 1880562712.

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

It can be written as a sum of positive squares in 2 ways, for example, as 791859600 + 1380791281 = 28140^2 + 37159^2 .

It is a cyclic number.

It is not a de Polignac number, because 2172650881 - 2³ = 2172650873 is a prime.

It is a super-2 number, since 2×2172650881² = 9440823701420152322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2172650891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63901480 + ... + 63901513.

It is an arithmetic number, because the mean of its divisors is an integer number (575113473).

Almost surely, 2^2172650881 is an apocalyptic number.

It is an amenable number.

2172650881 is a deficient number, since it is larger than the sum of its proper divisors (127803011).

2172650881 is a wasteful number, since it uses less digits than its factorization.

2172650881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127803010.

The product of its (nonzero) digits is 53760, while the sum is 40.

The square root of 2172650881 is about 46611.7032621637. The cubic root of 2172650881 is about 1295.1795601804.

The spelling of 2172650881 in words is "two billion, one hundred seventy-two million, six hundred fifty thousand, eight hundred eighty-one".