2175842861 has 2 divisors, whose sum is σ = 2175842862. Its totient is φ = 2175842860.

The previous prime is 2175842857. The next prime is 2175842909. The reversal of 2175842861 is 1682485712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2174356900 + 1485961 = 46630^2 + 1219^2 .

It is a cyclic number.

It is not a de Polignac number, because 2175842861 - 2² = 2175842857 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2175842561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1087921430 + 1087921431.

It is an arithmetic number, because the mean of its divisors is an integer number (1087921431).

Almost surely, 2^2175842861 is an apocalyptic number.

It is an amenable number.

2175842861 is a deficient number, since it is larger than the sum of its proper divisors (1).

2175842861 is an equidigital number, since it uses as much as digits as its factorization.

2175842861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 215040, while the sum is 44.

The square root of 2175842861 is about 46645.9308085925. The cubic root of 2175842861 is about 1295.8135267847.

The spelling of 2175842861 in words is "two billion, one hundred seventy-five million, eight hundred forty-two thousand, eight hundred sixty-one".