13281987 has 4 divisors (see below), whose sum is σ = 17709320. Its totient is φ = 8854656.

The previous prime is 13281973. The next prime is 13282019. The reversal of 13281987 is 78918231.

13281987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 13281987 - 2⁸ = 13281731 is a prime.

It is a super-2 number, since 2×13281987² = 352822357336338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13281967) 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, 2213662 + ... + 2213667.

It is an arithmetic number, because the mean of its divisors is an integer number (4427330).

Almost surely, 2^13281987 is an apocalyptic number.

13281987 is a deficient number, since it is larger than the sum of its proper divisors (4427333).

13281987 is an equidigital number, since it uses as much as digits as its factorization.

13281987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4427332.

The product of its digits is 24192, while the sum is 39.

The square root of 13281987 is about 3644.4460484414. The cubic root of 13281987 is about 236.8214396810.

The spelling of 13281987 in words is "thirteen million, two hundred eighty-one thousand, nine hundred eighty-seven".