13981641 has 4 divisors (see below), whose sum is σ = 18642192. Its totient is φ = 9321092.

The previous prime is 13981637. The next prime is 13981661. The reversal of 13981641 is 14618931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13981641 - 2² = 13981637 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13981601) 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, 2330271 + ... + 2330276.

It is an arithmetic number, because the mean of its divisors is an integer number (4660548).

Almost surely, 2^13981641 is an apocalyptic number.

It is an amenable number.

13981641 is a deficient number, since it is larger than the sum of its proper divisors (4660551).

13981641 is an equidigital number, since it uses as much as digits as its factorization.

13981641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4660550.

The product of its digits is 5184, while the sum is 33.

The square root of 13981641 is about 3739.2032573798. The cubic root of 13981641 is about 240.9088284235.

The spelling of 13981641 in words is "thirteen million, nine hundred eighty-one thousand, six hundred forty-one".