1287533313 has 24 divisors (see below), whose sum is σ = 2103986976. Its totient is φ = 780321600.

The previous prime is 1287533311. The next prime is 1287533321. The reversal of 1287533313 is 3133357821.

1287533313 is a `hidden beast` number, since 12 + 87 + 533 + 31 + 3 = 666.

It is not a de Polignac number, because 1287533313 - 2¹ = 1287533311 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1287533311) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 238168 + ... + 243513.

It is an arithmetic number, because the mean of its divisors is an integer number (87666124).

Almost surely, 2^1287533313 is an apocalyptic number.

It is an amenable number.

1287533313 is a deficient number, since it is larger than the sum of its proper divisors (816453663).

1287533313 is an equidigital number, since it uses as much as digits as its factorization.

1287533313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481707 (or 481695 counting only the distinct ones).

The product of its digits is 45360, while the sum is 36.

The square root of 1287533313 is about 35882.2144383537. The cubic root of 1287533313 is about 1087.8929395741.

The spelling of 1287533313 in words is "one billion, two hundred eighty-seven million, five hundred thirty-three thousand, three hundred thirteen".