13123231545 has 48 divisors (see below), whose sum is σ = 21488568192. Its totient is φ = 6838341120.

The previous prime is 13123231493. The next prime is 13123231547. The reversal of 13123231545 is 54513232131.

It is not a de Polignac number, because 13123231545 - 2¹⁰ = 13123230521 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13123231547) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9641665 + ... + 9643025.

It is an arithmetic number, because the mean of its divisors is an integer number (447678504).

Almost surely, 2^13123231545 is an apocalyptic number.

13123231545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13123231545 is a deficient number, since it is larger than the sum of its proper divisors (8365336647).

13123231545 is a wasteful number, since it uses less digits than its factorization.

13123231545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1630 (or 1551 counting only the distinct ones).

The product of its digits is 10800, while the sum is 30.

Adding to 13123231545 its reverse (54513232131), we get a palindrome (67636463676).

The spelling of 13123231545 in words is "thirteen billion, one hundred twenty-three million, two hundred thirty-one thousand, five hundred forty-five".