13661801 has 4 divisors (see below), whose sum is σ = 13673604. Its totient is φ = 13650000.

The previous prime is 13661797. The next prime is 13661803. The reversal of 13661801 is 10816631.

13661801 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10816631 = 7 ⋅1545233.

It can be written as a sum of positive squares in 2 ways, for example, as 1243225 + 12418576 = 1115^2 + 3524^2 .

It is a cyclic number.

It is not a de Polignac number, because 13661801 - 2² = 13661797 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13661803) 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, 3950 + ... + 6551.

It is an arithmetic number, because the mean of its divisors is an integer number (3418401).

Almost surely, 2^13661801 is an apocalyptic number.

It is an amenable number.

13661801 is a deficient number, since it is larger than the sum of its proper divisors (11803).

13661801 is a wasteful number, since it uses less digits than its factorization.

13661801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11802.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 13661801 is about 3696.1873599697. The cubic root of 13661801 is about 239.0576531491.

The spelling of 13661801 in words is "thirteen million, six hundred sixty-one thousand, eight hundred one".