1285311 has 8 divisors (see below), whose sum is σ = 1737520. Its totient is φ = 844992.

The previous prime is 1285301. The next prime is 1285351. The reversal of 1285311 is 1135821.

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

It is not a de Polignac number, because 1285311 - 2⁵ = 1285279 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 (1285301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2716 + ... + 3153.

It is an arithmetic number, because the mean of its divisors is an integer number (217190).

2^1285311 is an apocalyptic number.

1285311 is a deficient number, since it is larger than the sum of its proper divisors (452209).

1285311 is an equidigital number, since it uses as much as digits as its factorization.

1285311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5945.

The product of its digits is 240, while the sum is 21.

The square root of 1285311 is about 1133.7155727959. The cubic root of 1285311 is about 108.7266669455.

It can be divided in two parts, 1285 and 311, that added together give a triangular number (1596 = T₅₆).

The spelling of 1285311 in words is "one million, two hundred eighty-five thousand, three hundred eleven".