2172724903 has 4 divisors (see below), whose sum is σ = 2182468288. Its totient is φ = 2162981520.

The previous prime is 2172724891. The next prime is 2172724907. The reversal of 2172724903 is 3094272712.

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 2172724903 - 2⁹ = 2172724391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2172724907) 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, 4871358 + ... + 4871803.

It is an arithmetic number, because the mean of its divisors is an integer number (545617072).

Almost surely, 2^2172724903 is an apocalyptic number.

2172724903 is a deficient number, since it is larger than the sum of its proper divisors (9743385).

2172724903 is an equidigital number, since it uses as much as digits as its factorization.

2172724903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9743384.

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 2172724903 is about 46612.4972834539. The cubic root of 2172724903 is about 1295.1942688931.

The spelling of 2172724903 in words is "two billion, one hundred seventy-two million, seven hundred twenty-four thousand, nine hundred three".