1286251 has 4 divisors (see below), whose sum is σ = 1301832. Its totient is φ = 1270672.

The previous prime is 1286239. The next prime is 1286261. The reversal of 1286251 is 1526821.

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

It is a cyclic number.

It is not a de Polignac number, because 1286251 - 2¹⁷ = 1155179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1286261) 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, 7666 + ... + 7831.

It is an arithmetic number, because the mean of its divisors is an integer number (325458).

2^1286251 is an apocalyptic number.

1286251 is a deficient number, since it is larger than the sum of its proper divisors (15581).

1286251 is an equidigital number, since it uses as much as digits as its factorization.

1286251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15580.

The product of its digits is 960, while the sum is 25.

The square root of 1286251 is about 1134.1300630880. The cubic root of 1286251 is about 108.7531658919.

The spelling of 1286251 in words is "one million, two hundred eighty-six thousand, two hundred fifty-one".