13609491 has 32 divisors (see below), whose sum is σ = 22794240. Its totient is φ = 7042464.

The previous prime is 13609489. The next prime is 13609501. The reversal of 13609491 is 19490631.

It is not a de Polignac number, because 13609491 - 2¹ = 13609489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13609481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8436 + ... + 9918.

It is an arithmetic number, because the mean of its divisors is an integer number (712320).

Almost surely, 2^13609491 is an apocalyptic number.

13609491 is a deficient number, since it is larger than the sum of its proper divisors (9184749).

13609491 is a wasteful number, since it uses less digits than its factorization.

13609491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1535.

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 13609491 is about 3689.1043628501. The cubic root of 13609491 is about 238.7521516943.

The spelling of 13609491 in words is "thirteen million, six hundred nine thousand, four hundred ninety-one".