1281315 has 16 divisors (see below), whose sum is σ = 2343168. Its totient is φ = 585696.

The previous prime is 1281283. The next prime is 1281317. The reversal of 1281315 is 5131821.

1281315 = 296² + 297² + ... + 309².

It is not a de Polignac number, because 1281315 - 2⁵ = 1281283 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 1281291 and 1281300.

It is not an unprimeable number, because it can be changed into a prime (1281317) 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, 5997 + ... + 6206.

It is an arithmetic number, because the mean of its divisors is an integer number (146448).

2^1281315 is an apocalyptic number.

1281315 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1281315 is a deficient number, since it is larger than the sum of its proper divisors (1061853).

1281315 is a wasteful number, since it uses less digits than its factorization.

1281315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12218.

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

The square root of 1281315 is about 1131.9518540998. The cubic root of 1281315 is about 108.6138738045.

It can be divided in two parts, 1281 and 315, that added together give a triangular number (1596 = T₅₆).

The spelling of 1281315 in words is "one million, two hundred eighty-one thousand, three hundred fifteen".