12315894529 has 3 divisors (see below), whose sum is σ = 12316005507. Its totient is φ = 12315783552.

The previous prime is 12315894509. The next prime is 12315894533. The reversal of 12315894529 is 92549851321.

The square root of 12315894529 is 110977.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 8564577025 + 3751317504 = 92545^2 + 61248^2 .

It is not a de Polignac number, because 12315894529 - 2⁷ = 12315894401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12315894509) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 55489 + ... + 166465.

It is an arithmetic number, because the mean of its divisors is an integer number (4105335169).

Almost surely, 2^12315894529 is an apocalyptic number.

12315894529 is the 110977-th square number.

12315894529 is the 55489-th centered octagonal number.

It is an amenable number.

12315894529 is a deficient number, since it is larger than the sum of its proper divisors (110978).

12315894529 is an frugal number, since it uses more digits than its factorization.

12315894529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221954 (or 110977 counting only the distinct ones).

The product of its digits is 777600, while the sum is 49.

Multiplying 12315894529 by its sum of digits (49), we get a square (603478831921 = 776839²).

The spelling of 12315894529 in words is "twelve billion, three hundred fifteen million, eight hundred ninety-four thousand, five hundred twenty-nine".