13287761 has 4 divisors (see below), whose sum is σ = 14069412. Its totient is φ = 12506112.

The previous prime is 13287749. The next prime is 13287779. The reversal of 13287761 is 16778231.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10627600 + 2660161 = 3260^2 + 1631^2 .

It is a cyclic number.

It is not a de Polignac number, because 13287761 - 2⁶ = 13287697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13287161) 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, 390800 + ... + 390833.

It is an arithmetic number, because the mean of its divisors is an integer number (3517353).

Almost surely, 2^13287761 is an apocalyptic number.

It is an amenable number.

13287761 is a deficient number, since it is larger than the sum of its proper divisors (781651).

13287761 is an equidigital number, since it uses as much as digits as its factorization.

13287761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 781650.

The product of its digits is 14112, while the sum is 35.

The square root of 13287761 is about 3645.2381266524. The cubic root of 13287761 is about 236.8557520393.

The spelling of 13287761 in words is "thirteen million, two hundred eighty-seven thousand, seven hundred sixty-one".