13991361 has 4 divisors (see below), whose sum is σ = 18655152. Its totient is φ = 9327572.

The previous prime is 13991347. The next prime is 13991363. The reversal of 13991361 is 16319931.

It is a happy number.

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 13991361 - 2⁷ = 13991233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13991363) 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, 2331891 + ... + 2331896.

It is an arithmetic number, because the mean of its divisors is an integer number (4663788).

Almost surely, 2^13991361 is an apocalyptic number.

It is an amenable number.

13991361 is a deficient number, since it is larger than the sum of its proper divisors (4663791).

13991361 is an equidigital number, since it uses as much as digits as its factorization.

13991361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4663790.

The product of its digits is 4374, while the sum is 33.

The square root of 13991361 is about 3740.5027736923. The cubic root of 13991361 is about 240.9646418861.

The spelling of 13991361 in words is "thirteen million, nine hundred ninety-one thousand, three hundred sixty-one".