13235431540 has 24 divisors (see below), whose sum is σ = 29257270560. Its totient is φ = 5015531808.

The previous prime is 13235431529. The next prime is 13235431543. The reversal of 13235431540 is 4513453231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13235431543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17414662 + ... + 17415421.

It is an arithmetic number, because the mean of its divisors is an integer number (1219052940).

Almost surely, 2^13235431540 is an apocalyptic number.

13235431540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13235431540 is an abundant number, since it is smaller than the sum of its proper divisors (16021839020).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13235431540 is a wasteful number, since it uses less digits than its factorization.

13235431540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34830111 (or 34830109 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 31.

Adding to 13235431540 its reverse (4513453231), we get a palindrome (17748884771).

The spelling of 13235431540 in words is "thirteen billion, two hundred thirty-five million, four hundred thirty-one thousand, five hundred forty".