13012231545 has 24 divisors (see below), whose sum is σ = 23881273416. Its totient is φ = 6531629568.

The previous prime is 13012231543. The next prime is 13012231601. The reversal of 13012231545 is 54513221031.

13012231545 is a `hidden beast` number, since 1 + 301 + 2 + 2 + 315 + 45 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 6788441664 + 6223789881 = 82392^2 + 78891^2 .

It is not a de Polignac number, because 13012231545 - 2¹ = 13012231543 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13012231543) 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 23 ways as a sum of consecutive naturals, for example, 8503962 + ... + 8505491.

It is an arithmetic number, because the mean of its divisors is an integer number (995053059).

Almost surely, 2^13012231545 is an apocalyptic number.

13012231545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13012231545 is a deficient number, since it is larger than the sum of its proper divisors (10869041871).

13012231545 is a wasteful number, since it uses less digits than its factorization.

13012231545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17009481 (or 17009478 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

Adding to 13012231545 its reverse (54513221031), we get a palindrome (67525452576).

The spelling of 13012231545 in words is "thirteen billion, twelve million, two hundred thirty-one thousand, five hundred forty-five".