2172115156 has 6 divisors (see below), whose sum is σ = 3801201530. Its totient is φ = 1086057576.

The previous prime is 2172115133. The next prime is 2172115157. The reversal of 2172115156 is 6515112712.

2172115156 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 1829272900 + 342842256 = 42770^2 + 18516^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2172115157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 271514391 + ... + 271514398.

Almost surely, 2^2172115156 is an apocalyptic number.

It is an amenable number.

2172115156 is a deficient number, since it is larger than the sum of its proper divisors (1629086374).

2172115156 is a wasteful number, since it uses less digits than its factorization.

2172115156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543028793 (or 543028791 counting only the distinct ones).

The product of its digits is 4200, while the sum is 31.

The square root of 2172115156 is about 46605.9562287912. The cubic root of 2172115156 is about 1295.0730977457.

Adding to 2172115156 its reverse (6515112712), we get a palindrome (8687227868).

The spelling of 2172115156 in words is "two billion, one hundred seventy-two million, one hundred fifteen thousand, one hundred fifty-six".