2172155723 has 2 divisors, whose sum is σ = 2172155724. Its totient is φ = 2172155722.

The previous prime is 2172155701. The next prime is 2172155731. The reversal of 2172155723 is 3275512712.

2172155723 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2172155723 - 2⁶ = 2172155659 is a prime.

It is not a weakly prime, because it can be changed into another prime (2172155123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1086077861 + 1086077862.

It is an arithmetic number, because the mean of its divisors is an integer number (1086077862).

Almost surely, 2^2172155723 is an apocalyptic number.

2172155723 is a deficient number, since it is larger than the sum of its proper divisors (1).

2172155723 is an equidigital number, since it uses as much as digits as its factorization.

2172155723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29400, while the sum is 35.

The square root of 2172155723 is about 46606.3914393723. The cubic root of 2172155723 is about 1295.0811600720.

The spelling of 2172155723 in words is "two billion, one hundred seventy-two million, one hundred fifty-five thousand, seven hundred twenty-three".