13731661 has 8 divisors (see below), whose sum is σ = 14762880. Its totient is φ = 12731328.

The previous prime is 13731659. The next prime is 13731673. The reversal of 13731661 is 16613731.

13731661 = 289² + 290² + ... + 402².

13731661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13731661 - 2¹ = 13731659 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 (13731961) 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, 6796 + ... + 8581.

It is an arithmetic number, because the mean of its divisors is an integer number (1845360).

Almost surely, 2^13731661 is an apocalyptic number.

It is an amenable number.

13731661 is a deficient number, since it is larger than the sum of its proper divisors (1031219).

13731661 is a wasteful number, since it uses less digits than its factorization.

13731661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15443.

The product of its digits is 2268, while the sum is 28.

The square root of 13731661 is about 3705.6255882104. The cubic root of 13731661 is about 239.4644365585.

The spelling of 13731661 in words is "thirteen million, seven hundred thirty-one thousand, six hundred sixty-one".