13631917 has 4 divisors (see below), whose sum is σ = 14680540. Its totient is φ = 12583296.

The previous prime is 13631899. The next prime is 13631921. The reversal of 13631917 is 71913631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71913631 = 41 ⋅1753991.

It can be written as a sum of positive squares in 2 ways, for example, as 5503716 + 8128201 = 2346^2 + 2851^2 .

It is a cyclic number.

It is not a de Polignac number, because 13631917 - 2¹⁵ = 13599149 is a prime.

It is a super-2 number, since 2×13631917² = 371658322189778, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13631957) 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, 524292 + ... + 524317.

It is an arithmetic number, because the mean of its divisors is an integer number (3670135).

Almost surely, 2^13631917 is an apocalyptic number.

It is an amenable number.

13631917 is a deficient number, since it is larger than the sum of its proper divisors (1048623).

13631917 is a wasteful number, since it uses less digits than its factorization.

13631917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1048622.

The product of its digits is 3402, while the sum is 31.

The square root of 13631917 is about 3692.1426028798. The cubic root of 13631917 is about 238.8832199684.

The spelling of 13631917 in words is "thirteen million, six hundred thirty-one thousand, nine hundred seventeen".