1173129438321 has 27 divisors (see below), whose sum is σ = 1703205130809. Its totient is φ = 778098277512.

The previous prime is 1173129438311. The next prime is 1173129438347. The reversal of 1173129438321 is 1238349213711.

The square root of 1173129438321 is 1083111.

It is a perfect power (a square), and thus also a powerful number.

1173129438321 is a `hidden beast` number, since 1 + 1 + 7 + 3 + 1 + 294 + 38 + 321 = 666.

It is not a de Polignac number, because 1173129438321 - 2¹¹ = 1173129436273 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1173129438311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 724600450 + ... + 724602068.

Almost surely, 2^{1173129438321} is an apocalyptic number.

1173129438321 is the 1083111-st square number.

1173129438321 is the 541556-th centered octagonal number.

It is an amenable number.

1173129438321 is a deficient number, since it is larger than the sum of its proper divisors (530075692488).

1173129438321 is an frugal number, since it uses more digits than its factorization.

1173129438321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3690 (or 1845 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The spelling of 1173129438321 in words is "one trillion, one hundred seventy-three billion, one hundred twenty-nine million, four hundred thirty-eight thousand, three hundred twenty-one".