2172227917 has 2 divisors, whose sum is σ = 2172227918. Its totient is φ = 2172227916.

The previous prime is 2172227891. The next prime is 2172227923. The reversal of 2172227917 is 7197222712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1874803401 + 297424516 = 43299^2 + 17246^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2172227917 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2172227917.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2172227987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1086113958 + 1086113959.

It is an arithmetic number, because the mean of its divisors is an integer number (1086113959).

Almost surely, 2^2172227917 is an apocalyptic number.

It is an amenable number.

2172227917 is a deficient number, since it is larger than the sum of its proper divisors (1).

2172227917 is an equidigital number, since it uses as much as digits as its factorization.

2172227917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 49392, while the sum is 40.

The square root of 2172227917 is about 46607.1659404431. The cubic root of 2172227917 is about 1295.0955077317.

The spelling of 2172227917 in words is "two billion, one hundred seventy-two million, two hundred twenty-seven thousand, nine hundred seventeen".