1673118721 has 8 divisors (see below), whose sum is σ = 1731634920. Its totient is φ = 1614657408.

The previous prime is 1673118719. The next prime is 1673118749. The reversal of 1673118721 is 1278113761.

It can be written as a sum of positive squares in 4 ways, for example, as 297079696 + 1376039025 = 17236^2 + 37095^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1673118721 - 2¹ = 1673118719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1673118751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54055 + ... + 79171.

It is an arithmetic number, because the mean of its divisors is an integer number (216454365).

Almost surely, 2^1673118721 is an apocalyptic number.

It is an amenable number.

1673118721 is a deficient number, since it is larger than the sum of its proper divisors (58516199).

1673118721 is a wasteful number, since it uses less digits than its factorization.

1673118721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27443.

The product of its digits is 14112, while the sum is 37.

The square root of 1673118721 is about 40903.7739212411. The cubic root of 1673118721 is about 1187.1590827233.

The spelling of 1673118721 in words is "one billion, six hundred seventy-three million, one hundred eighteen thousand, seven hundred twenty-one".