1261285 has 8 divisors (see below), whose sum is σ = 1524600. Its totient is φ = 1001664.

The previous prime is 1261279. The next prime is 1261289. The reversal of 1261285 is 5821621.

It can be written as a sum of positive squares in 4 ways, for example, as 2401 + 1258884 = 49^2 + 1122^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1261285 - 2⁷ = 1261157 is a prime.

1261285 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102 + ... + 1591.

It is an arithmetic number, because the mean of its divisors is an integer number (190575).

2^1261285 is an apocalyptic number.

It is an amenable number.

1261285 is a deficient number, since it is larger than the sum of its proper divisors (263315).

1261285 is a wasteful number, since it uses less digits than its factorization.

1261285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1847.

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

The square root of 1261285 is about 1123.0694546643. The cubic root of 1261285 is about 108.0449344342.

The spelling of 1261285 in words is "one million, two hundred sixty-one thousand, two hundred eighty-five".