1281315585 has 96 divisors (see below), whose sum is σ = 2411773056. Its totient is φ = 578406400.

The previous prime is 1281315569. The next prime is 1281315599. The reversal of 1281315585 is 5855131821.

It is a happy number.

It is not a de Polignac number, because 1281315585 - 2⁴ = 1281315569 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 4041847 + ... + 4042163.

It is an arithmetic number, because the mean of its divisors is an integer number (25122636).

Almost surely, 2^1281315585 is an apocalyptic number.

1281315585 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1281315585 is a deficient number, since it is larger than the sum of its proper divisors (1130457471).

1281315585 is a wasteful number, since it uses less digits than its factorization.

1281315585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495 (or 484 counting only the distinct ones).

The product of its digits is 48000, while the sum is 39.

The square root of 1281315585 is about 35795.4687774863. The cubic root of 1281315585 is about 1086.1389033418.

The spelling of 1281315585 in words is "one billion, two hundred eighty-one million, three hundred fifteen thousand, five hundred eighty-five".