13621749231 has 4 divisors (see below), whose sum is σ = 18162332312. Its totient is φ = 9081166152.

The previous prime is 13621749203. The next prime is 13621749247. The reversal of 13621749231 is 13294712631.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 13621749231 - 2²⁵ = 13588194799 is a prime.

It is a super-2 number, since 2×13621749231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13621749231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13621749131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2270291536 + ... + 2270291541.

It is an arithmetic number, because the mean of its divisors is an integer number (4540583078).

Almost surely, 2^13621749231 is an apocalyptic number.

13621749231 is a deficient number, since it is larger than the sum of its proper divisors (4540583081).

13621749231 is an equidigital number, since it uses as much as digits as its factorization.

13621749231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4540583080.

The product of its digits is 54432, while the sum is 39.

The spelling of 13621749231 in words is "thirteen billion, six hundred twenty-one million, seven hundred forty-nine thousand, two hundred thirty-one".