1673573221 has 4 divisors (see below), whose sum is σ = 1676667244. Its totient is φ = 1670479200.

The previous prime is 1673573191. The next prime is 1673573249. The reversal of 1673573221 is 1223753761.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1274133025 + 399440196 = 35695^2 + 19986^2 .

It is a cyclic number.

It is not a de Polignac number, because 1673573221 - 2²⁵ = 1640018789 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 (1673573261) 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, 1546200 + ... + 1547281.

It is an arithmetic number, because the mean of its divisors is an integer number (419166811).

Almost surely, 2^1673573221 is an apocalyptic number.

It is an amenable number.

1673573221 is a deficient number, since it is larger than the sum of its proper divisors (3094023).

1673573221 is an equidigital number, since it uses as much as digits as its factorization.

1673573221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3094022.

The product of its digits is 52920, while the sum is 37.

The square root of 1673573221 is about 40909.3292660733. The cubic root of 1673573221 is about 1187.2665696072.

The spelling of 1673573221 in words is "one billion, six hundred seventy-three million, five hundred seventy-three thousand, two hundred twenty-one".