1281478559 has 4 divisors (see below), whose sum is σ = 1285281504. Its totient is φ = 1277675616.

The previous prime is 1281478537. The next prime is 1281478591. The reversal of 1281478559 is 9558741821.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1281478559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281478259) 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, 1900967 + ... + 1901640.

It is an arithmetic number, because the mean of its divisors is an integer number (321320376).

Almost surely, 2^1281478559 is an apocalyptic number.

1281478559 is a deficient number, since it is larger than the sum of its proper divisors (3802945).

1281478559 is an equidigital number, since it uses as much as digits as its factorization.

1281478559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3802944.

The product of its digits is 806400, while the sum is 50.

The square root of 1281478559 is about 35797.7451664207. The cubic root of 1281478559 is about 1086.1849510392.

The spelling of 1281478559 in words is "one billion, two hundred eighty-one million, four hundred seventy-eight thousand, five hundred fifty-nine".