13991641 has 8 divisors (see below), whose sum is σ = 14455584. Its totient is φ = 13534080.

The previous prime is 13991639. The next prime is 13991651. The reversal of 13991641 is 14619931.

It is a happy number.

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 13991641 - 2¹ = 13991639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13991597 and 13991606.

It is not an unprimeable number, because it can be changed into a prime (13991651) 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, 3081 + ... + 6121.

It is an arithmetic number, because the mean of its divisors is an integer number (1806948).

Almost surely, 2^13991641 is an apocalyptic number.

It is an amenable number.

13991641 is a deficient number, since it is larger than the sum of its proper divisors (463943).

13991641 is a wasteful number, since it uses less digits than its factorization.

13991641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3191.

The product of its digits is 5832, while the sum is 34.

The square root of 13991641 is about 3740.5402016286. The cubic root of 13991641 is about 240.9662492982.

The spelling of 13991641 in words is "thirteen million, nine hundred ninety-one thousand, six hundred forty-one".