1286501 has 4 divisors (see below), whose sum is σ = 1288812. Its totient is φ = 1284192.

The previous prime is 1286491. The next prime is 1286503. The reversal of 1286501 is 1056821.

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

It can be written as a sum of positive squares in 2 ways, for example, as 722500 + 564001 = 850^2 + 751^2 .

It is a cyclic number.

It is not a de Polignac number, because 1286501 - 2¹⁸ = 1024357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1286503) 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, 251 + ... + 1623.

It is an arithmetic number, because the mean of its divisors is an integer number (322203).

2^1286501 is an apocalyptic number.

It is an amenable number.

1286501 is a deficient number, since it is larger than the sum of its proper divisors (2311).

1286501 is an equidigital number, since it uses as much as digits as its factorization.

1286501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2310.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 1286501 is about 1134.2402743687. The cubic root of 1286501 is about 108.7602113105.

The spelling of 1286501 in words is "one million, two hundred eighty-six thousand, five hundred one".