1723142321 has 4 divisors (see below), whose sum is σ = 1824503652. Its totient is φ = 1621780992.

The previous prime is 1723142293. The next prime is 1723142327. The reversal of 1723142321 is 1232413271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1232413271 = 9311 ⋅132361.

It can be written as a sum of positive squares in 2 ways, for example, as 1595203600 + 127938721 = 39940^2 + 11311^2 .

It is a cyclic number.

It is not a de Polignac number, because 1723142321 - 2⁶ = 1723142257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1723142327) 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, 50680640 + ... + 50680673.

It is an arithmetic number, because the mean of its divisors is an integer number (456125913).

Almost surely, 2^1723142321 is an apocalyptic number.

It is an amenable number.

1723142321 is a deficient number, since it is larger than the sum of its proper divisors (101361331).

1723142321 is a wasteful number, since it uses less digits than its factorization.

1723142321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101361330.

The product of its digits is 2016, while the sum is 26.

The square root of 1723142321 is about 41510.7494632414. The cubic root of 1723142321 is about 1198.8744819395.

Adding to 1723142321 its reverse (1232413271), we get a palindrome (2955555592).

The spelling of 1723142321 in words is "one billion, seven hundred twenty-three million, one hundred forty-two thousand, three hundred twenty-one".