1286281 has 4 divisors (see below), whose sum is σ = 1354000. Its totient is φ = 1218564.

The previous prime is 1286273. The next prime is 1286287. The reversal of 1286281 is 1826821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1826821 = 23 ⋅79427.

It is a cyclic number.

It is not a de Polignac number, because 1286281 - 2³ = 1286273 is a prime.

It is a super-2 number, since 2×1286281² = 3309037621922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1286287) 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, 33831 + ... + 33868.

It is an arithmetic number, because the mean of its divisors is an integer number (338500).

2^1286281 is an apocalyptic number.

It is an amenable number.

1286281 is a deficient number, since it is larger than the sum of its proper divisors (67719).

1286281 is an equidigital number, since it uses as much as digits as its factorization.

1286281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67718.

The product of its digits is 1536, while the sum is 28.

The square root of 1286281 is about 1134.1432890072. The cubic root of 1286281 is about 108.7540113903.

The spelling of 1286281 in words is "one million, two hundred eighty-six thousand, two hundred eighty-one".