13631409 has 20 divisors (see below), whose sum is σ = 22215600. Its totient is φ = 8260920.

The previous prime is 13631383. The next prime is 13631411. The reversal of 13631409 is 90413631.

It is not a de Polignac number, because 13631409 - 2⁵ = 13631377 is a prime.

It is a super-2 number, since 2×13631409² = 371630622650562, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (13631459) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6759 + ... + 8540.

It is an arithmetic number, because the mean of its divisors is an integer number (1110780).

Almost surely, 2^13631409 is an apocalyptic number.

It is an amenable number.

13631409 is a deficient number, since it is larger than the sum of its proper divisors (8584191).

13631409 is a wasteful number, since it uses less digits than its factorization.

13631409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15322 (or 15313 counting only the distinct ones).

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

The square root of 13631409 is about 3692.0738074963. The cubic root of 13631409 is about 238.8802525652.

It can be divided in two parts, 1363 and 1409, that added together give a palindrome (2772).

The spelling of 13631409 in words is "thirteen million, six hundred thirty-one thousand, four hundred nine".