13631216789 has 4 divisors (see below), whose sum is σ = 13643421324. Its totient is φ = 13619012256.

The previous prime is 13631216779. The next prime is 13631216827. The reversal of 13631216789 is 98761213631.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5397106225 + 8234110564 = 73465^2 + 90742^2 .

It is a cyclic number.

It is not a de Polignac number, because 13631216789 - 2⁴ = 13631216773 is a prime.

It is a super-2 number, since 2×13631216789² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13631216779) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6100592 + ... + 6102825.

It is an arithmetic number, because the mean of its divisors is an integer number (3410855331).

Almost surely, 2^13631216789 is an apocalyptic number.

It is an amenable number.

13631216789 is a deficient number, since it is larger than the sum of its proper divisors (12204535).

13631216789 is a wasteful number, since it uses less digits than its factorization.

13631216789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12204534.

The product of its digits is 326592, while the sum is 47.

The spelling of 13631216789 in words is "thirteen billion, six hundred thirty-one million, two hundred sixteen thousand, seven hundred eighty-nine".