2031720173 has 24 divisors (see below), whose sum is σ = 2393452800. Its totient is φ = 1719469248.

The previous prime is 2031720169. The next prime is 2031720181. The reversal of 2031720173 is 3710271302.

It is not a de Polignac number, because 2031720173 - 2² = 2031720169 is a prime.

It is a super-2 number, since 2×2031720173² = 8255773722750299858, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2031726173) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2510993 + ... + 2511801.

It is an arithmetic number, because the mean of its divisors is an integer number (99727200).

Almost surely, 2^2031720173 is an apocalyptic number.

It is an amenable number.

2031720173 is a deficient number, since it is larger than the sum of its proper divisors (361732627).

2031720173 is a wasteful number, since it uses less digits than its factorization.

2031720173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1409 (or 1402 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 26.

The square root of 2031720173 is about 45074.6067425995. The cubic root of 2031720173 is about 1266.5469621489.

Adding to 2031720173 its reverse (3710271302), we get a palindrome (5741991475).

The spelling of 2031720173 in words is "two billion, thirty-one million, seven hundred twenty thousand, one hundred seventy-three".