13631687 has 4 divisors (see below), whose sum is σ = 13804320. Its totient is φ = 13459056.

The previous prime is 13631677. The next prime is 13631689. The reversal of 13631687 is 78613631.

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

It is a cyclic number.

It is not a de Polignac number, because 13631687 - 2¹⁰ = 13630663 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 (13631689) 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, 86198 + ... + 86355.

It is an arithmetic number, because the mean of its divisors is an integer number (3451080).

Almost surely, 2^13631687 is an apocalyptic number.

13631687 is a deficient number, since it is larger than the sum of its proper divisors (172633).

13631687 is an equidigital number, since it uses as much as digits as its factorization.

13631687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172632.

The product of its digits is 18144, while the sum is 35.

The square root of 13631687 is about 3692.1114555224. Note that the first 3 decimals coincide. The cubic root of 13631687 is about 238.8818764682.

The spelling of 13631687 in words is "thirteen million, six hundred thirty-one thousand, six hundred eighty-seven".