13649591 has 4 divisors (see below), whose sum is σ = 13881000. Its totient is φ = 13418184.

The previous prime is 13649563. The next prime is 13649593. The reversal of 13649591 is 19594631.

13649591 is digitally balanced in base 2 and base 3, because in such bases 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: 19594631 = 7 ⋅2799233.

It is a cyclic number.

It is not a de Polignac number, because 13649591 - 2¹⁸ = 13387447 is a prime.

It is a super-2 number, since 2×13649591² = 372622668934562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13649593) 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, 115616 + ... + 115733.

It is an arithmetic number, because the mean of its divisors is an integer number (3470250).

Almost surely, 2^13649591 is an apocalyptic number.

13649591 is a deficient number, since it is larger than the sum of its proper divisors (231409).

13649591 is an equidigital number, since it uses as much as digits as its factorization.

13649591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231408.

The product of its digits is 29160, while the sum is 38.

The square root of 13649591 is about 3694.5352887745. The cubic root of 13649591 is about 238.9864140314.

The spelling of 13649591 in words is "thirteen million, six hundred forty-nine thousand, five hundred ninety-one".