13681445 has 8 divisors (see below), whose sum is σ = 16444536. Its totient is φ = 10927296.

The previous prime is 13681433. The next prime is 13681469. The reversal of 13681445 is 54418631.

It can be written as a sum of positive squares in 4 ways, for example, as 5207524 + 8473921 = 2282^2 + 2911^2 .

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 13681445 - 2⁴ = 13681429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1799 + ... + 5531.

It is an arithmetic number, because the mean of its divisors is an integer number (2055567).

Almost surely, 2^13681445 is an apocalyptic number.

It is an amenable number.

13681445 is a deficient number, since it is larger than the sum of its proper divisors (2763091).

13681445 is an equidigital number, since it uses as much as digits as its factorization.

13681445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4471.

The product of its digits is 11520, while the sum is 32.

The square root of 13681445 is about 3698.8437382512. The cubic root of 13681445 is about 239.1721768382.

The spelling of 13681445 in words is "thirteen million, six hundred eighty-one thousand, four hundred forty-five".