1281859 has 4 divisors (see below), whose sum is σ = 1337616. Its totient is φ = 1226104.

The previous prime is 1281853. The next prime is 1281871. The reversal of 1281859 is 9581821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9581821 = 31 ⋅309091.

It is a cyclic number.

It is not a de Polignac number, because 1281859 - 2⁵ = 1281827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1281853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27844 + ... + 27889.

It is an arithmetic number, because the mean of its divisors is an integer number (334404).

2^1281859 is an apocalyptic number.

1281859 is a deficient number, since it is larger than the sum of its proper divisors (55757).

1281859 is an equidigital number, since it uses as much as digits as its factorization.

1281859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55756.

The product of its digits is 5760, while the sum is 34.

The square root of 1281859 is about 1132.1921215059. The cubic root of 1281859 is about 108.6292428037.

The spelling of 1281859 in words is "one million, two hundred eighty-one thousand, eight hundred fifty-nine".