1243142173 has 8 divisors (see below), whose sum is σ = 1530021248. Its totient is φ = 983584944.

The previous prime is 1243142149. The next prime is 1243142179. The reversal of 1243142173 is 3712413421.

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 1243142173 - 2⁵ = 1243142141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243142179) 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, 6830361 + ... + 6830542.

It is an arithmetic number, because the mean of its divisors is an integer number (191252656).

Almost surely, 2^1243142173 is an apocalyptic number.

1243142173 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1243142173 is a deficient number, since it is larger than the sum of its proper divisors (286879075).

1243142173 is a wasteful number, since it uses less digits than its factorization.

1243142173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13660923.

The product of its digits is 4032, while the sum is 28.

The square root of 1243142173 is about 35258.2213533241. The cubic root of 1243142173 is about 1075.2437660285.

Adding to 1243142173 its reverse (3712413421), we get a palindrome (4955555594).

The spelling of 1243142173 in words is "one billion, two hundred forty-three million, one hundred forty-two thousand, one hundred seventy-three".