172868811 has 4 divisors (see below), whose sum is σ = 230491752. Its totient is φ = 115245872.

The previous prime is 172868809. The next prime is 172868819. The reversal of 172868811 is 118868271.

172868811 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 172868811 - 2¹ = 172868809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (172868819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28811466 + ... + 28811471.

It is an arithmetic number, because the mean of its divisors is an integer number (57622938).

Almost surely, 2^172868811 is an apocalyptic number.

172868811 is a deficient number, since it is larger than the sum of its proper divisors (57622941).

172868811 is an equidigital number, since it uses as much as digits as its factorization.

172868811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57622940.

The product of its digits is 43008, while the sum is 42.

The square root of 172868811 is about 13147.9584346772. The cubic root of 172868811 is about 557.0645836408.

The spelling of 172868811 in words is "one hundred seventy-two million, eight hundred sixty-eight thousand, eight hundred eleven".