13531609 has 16 divisors (see below), whose sum is σ = 17635968. Its totient is φ = 10075392.

The previous prime is 13531607. The next prime is 13531633. The reversal of 13531609 is 90613531.

It is a cyclic number.

It is not a de Polignac number, because 13531609 - 2¹ = 13531607 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13531607) 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, 2827 + ... + 5920.

It is an arithmetic number, because the mean of its divisors is an integer number (1102248).

Almost surely, 2^13531609 is an apocalyptic number.

It is an amenable number.

13531609 is a deficient number, since it is larger than the sum of its proper divisors (4104359).

13531609 is a wasteful number, since it uses less digits than its factorization.

13531609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8784.

The product of its (nonzero) digits is 2430, while the sum is 28.

The square root of 13531609 is about 3678.5335393333. The cubic root of 13531609 is about 238.2958505721.

The spelling of 13531609 in words is "thirteen million, five hundred thirty-one thousand, six hundred nine".