1285261 has 4 divisors (see below), whose sum is σ = 1304512. Its totient is φ = 1266012.

The previous prime is 1285259. The next prime is 1285267. The reversal of 1285261 is 1625821.

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.

It is a cyclic number.

It is not a de Polignac number, because 1285261 - 2¹ = 1285259 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 (1285267) 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, 9525 + ... + 9658.

It is an arithmetic number, because the mean of its divisors is an integer number (326128).

2^1285261 is an apocalyptic number.

It is an amenable number.

1285261 is a deficient number, since it is larger than the sum of its proper divisors (19251).

1285261 is an equidigital number, since it uses as much as digits as its factorization.

1285261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19250.

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

The square root of 1285261 is about 1133.6935211952. The cubic root of 1285261 is about 108.7252570652.

The spelling of 1285261 in words is "one million, two hundred eighty-five thousand, two hundred sixty-one".