13503661 has 16 divisors (see below), whose sum is σ = 15240960. Its totient is φ = 11888640.

The previous prime is 13503653. The next prime is 13503667. The reversal of 13503661 is 16630531.

13503661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 13503661 - 2³ = 13503653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13503667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31116 + ... + 31546.

It is an arithmetic number, because the mean of its divisors is an integer number (952560).

Almost surely, 2^13503661 is an apocalyptic number.

It is an amenable number.

13503661 is a deficient number, since it is larger than the sum of its proper divisors (1737299).

13503661 is a wasteful number, since it uses less digits than its factorization.

13503661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 13503661 is about 3674.7327794004. The cubic root of 13503661 is about 238.1316798323.

The spelling of 13503661 in words is "thirteen million, five hundred three thousand, six hundred sixty-one".