1323251172729 has 12 divisors (see below), whose sum is σ = 1918468246500. Its totient is φ = 878888013984.

The previous prime is 1323251172521. The next prime is 1323251172757. The reversal of 1323251172729 is 9272711523231.

1323251172729 is a `hidden beast` number, since 1 + 32 + 32 + 511 + 7 + 2 + 72 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 175946691600 + 1147304481129 = 419460^2 + 1071123^2 .

It is not a de Polignac number, because 1323251172729 - 2¹² = 1323251168633 is a prime.

It is a super-2 number, since 2×1323251172729² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1323251172769) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 273283654 + ... + 273288495.

It is an arithmetic number, because the mean of its divisors is an integer number (159872353875).

Almost surely, 2^{1323251172729} is an apocalyptic number.

It is an amenable number.

1323251172729 is a deficient number, since it is larger than the sum of its proper divisors (595217073771).

1323251172729 is a wasteful number, since it uses less digits than its factorization.

1323251172729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546572424 (or 546572421 counting only the distinct ones).

The product of its digits is 317520, while the sum is 45.

The spelling of 1323251172729 in words is "one trillion, three hundred twenty-three billion, two hundred fifty-one million, one hundred seventy-two thousand, seven hundred twenty-nine".