13287561 has 16 divisors (see below), whose sum is σ = 20901888. Its totient is φ = 7347600.

The previous prime is 13287541. The next prime is 13287587. The reversal of 13287561 is 16578231.

It is not a de Polignac number, because 13287561 - 2⁶ = 13287497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13287541) 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, 9555 + ... + 10856.

It is an arithmetic number, because the mean of its divisors is an integer number (1306368).

Almost surely, 2^13287561 is an apocalyptic number.

It is an amenable number.

13287561 is a deficient number, since it is larger than the sum of its proper divisors (7614327).

13287561 is a wasteful number, since it uses less digits than its factorization.

13287561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20452.

The product of its digits is 10080, while the sum is 33.

The square root of 13287561 is about 3645.2106934991. The cubic root of 13287561 is about 236.8545636929.

The spelling of 13287561 in words is "thirteen million, two hundred eighty-seven thousand, five hundred sixty-one".