1281513 has 8 divisors (see below), whose sum is σ = 1724800. Its totient is φ = 846288.

The previous prime is 1281503. The next prime is 1281521. The reversal of 1281513 is 3151821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1281513 - 2⁸ = 1281257 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1281513.

It is not an unprimeable number, because it can be changed into a prime (1281503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1633 + ... + 2286.

It is an arithmetic number, because the mean of its divisors is an integer number (215600).

2^1281513 is an apocalyptic number.

It is an amenable number.

1281513 is a deficient number, since it is larger than the sum of its proper divisors (443287).

1281513 is a wasteful number, since it uses less digits than its factorization.

1281513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4031.

The product of its digits is 240, while the sum is 21.

The square root of 1281513 is about 1132.0393102715. The cubic root of 1281513 is about 108.6194681716.

The spelling of 1281513 in words is "one million, two hundred eighty-one thousand, five hundred thirteen".