2173722945 has 16 divisors (see below), whose sum is σ = 3590149632. Its totient is φ = 1121921280.

The previous prime is 2173722919. The next prime is 2173722961. The reversal of 2173722945 is 5492273712.

It is not a de Polignac number, because 2173722945 - 2¹² = 2173718849 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2173722897 and 2173722906.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2336872 + ... + 2337801.

It is an arithmetic number, because the mean of its divisors is an integer number (224384352).

Almost surely, 2^2173722945 is an apocalyptic number.

It is an amenable number.

2173722945 is a deficient number, since it is larger than the sum of its proper divisors (1416426687).

2173722945 is a wasteful number, since it uses less digits than its factorization.

2173722945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4674712.

The product of its digits is 211680, while the sum is 42.

The square root of 2173722945 is about 46623.2017883800. The cubic root of 2173722945 is about 1295.3925545266.

The spelling of 2173722945 in words is "two billion, one hundred seventy-three million, seven hundred twenty-two thousand, nine hundred forty-five".