13631661 has 12 divisors (see below), whose sum is σ = 20325760. Its totient is φ = 8794440.

The previous prime is 13631659. The next prime is 13631677. The reversal of 13631661 is 16613631.

It is a happy number.

13631661 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13631661 - 2¹ = 13631659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13631621) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24151 + ... + 24708.

Almost surely, 2^13631661 is an apocalyptic number.

It is an amenable number.

13631661 is a deficient number, since it is larger than the sum of its proper divisors (6694099).

13631661 is a wasteful number, since it uses less digits than its factorization.

13631661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48896 (or 48893 counting only the distinct ones).

The product of its digits is 1944, while the sum is 27.

The square root of 13631661 is about 3692.1079345003. The cubic root of 13631661 is about 238.8817245933.

The spelling of 13631661 in words is "thirteen million, six hundred thirty-one thousand, six hundred sixty-one".