13660491 has 16 divisors (see below), whose sum is σ = 20249600. Its totient is φ = 8134560.

The previous prime is 13660489. The next prime is 13660499. The reversal of 13660491 is 19406631.

It is not a de Polignac number, because 13660491 - 2¹ = 13660489 is a prime.

It is a super-2 number, since 2×13660491² = 373218028722162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13660499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4441 + ... + 6858.

It is an arithmetic number, because the mean of its divisors is an integer number (1265600).

Almost surely, 2^13660491 is an apocalyptic number.

13660491 is a deficient number, since it is larger than the sum of its proper divisors (6589109).

13660491 is a wasteful number, since it uses less digits than its factorization.

13660491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11346.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 13660491 is about 3696.0101460900. The cubic root of 13660491 is about 239.0500120009.

The spelling of 13660491 in words is "thirteen million, six hundred sixty thousand, four hundred ninety-one".