2172360961 has 4 divisors (see below), whose sum is σ = 2183388372. Its totient is φ = 2161333552.

The previous prime is 2172360923. The next prime is 2172360977. The reversal of 2172360961 is 1690632712.

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 1923699600 + 248661361 = 43860^2 + 15769^2 .

It is a cyclic number.

It is not a de Polignac number, because 2172360961 - 2¹¹ = 2172358913 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2172360961.

It is not an unprimeable number, because it can be changed into a prime (2172360901) 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 3 ways as a sum of consecutive naturals, for example, 5513410 + ... + 5513803.

It is an arithmetic number, because the mean of its divisors is an integer number (545847093).

Almost surely, 2^2172360961 is an apocalyptic number.

It is an amenable number.

2172360961 is a deficient number, since it is larger than the sum of its proper divisors (11027411).

2172360961 is a wasteful number, since it uses less digits than its factorization.

2172360961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11027410.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 2172360961 is about 46608.5932098363. The cubic root of 2172360961 is about 1295.1219477395.

The spelling of 2172360961 in words is "two billion, one hundred seventy-two million, three hundred sixty thousand, nine hundred sixty-one".