1243653173 has 20 divisors (see below), whose sum is σ = 1536236460. Its totient is φ = 1003250304.

The previous prime is 1243653167. The next prime is 1243653179. The reversal of 1243653173 is 3713563421.

It is an interprime number because it is at equal distance from previous prime (1243653167) and next prime (1243653179).

It can be written as a sum of positive squares in 2 ways, for example, as 816073489 + 427579684 = 28567^2 + 20678^2 .

It is not a de Polignac number, because 1243653173 - 2¹⁶ = 1243587637 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 (1243653179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 25583 + ... + 56051.

It is an arithmetic number, because the mean of its divisors is an integer number (76811823).

Almost surely, 2^1243653173 is an apocalyptic number.

It is an amenable number.

1243653173 is a deficient number, since it is larger than the sum of its proper divisors (292583287).

1243653173 is an frugal number, since it uses more digits than its factorization.

1243653173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30514 (or 30493 counting only the distinct ones).

The product of its digits is 45360, while the sum is 35.

The square root of 1243653173 is about 35265.4671456370. The cubic root of 1243653173 is about 1075.3910740111.

The spelling of 1243653173 in words is "one billion, two hundred forty-three million, six hundred fifty-three thousand, one hundred seventy-three".