1291285 has 8 divisors (see below), whose sum is σ = 1565496. Its totient is φ = 1022400.

The previous prime is 1291271. The next prime is 1291313. The reversal of 1291285 is 5821921.

It can be written as a sum of positive squares in 4 ways, for example, as 386884 + 904401 = 622^2 + 951^2 .

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

It is not a de Polignac number, because 1291285 - 2¹¹ = 1289237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 774 + ... + 1783.

It is an arithmetic number, because the mean of its divisors is an integer number (195687).

2^1291285 is an apocalyptic number.

It is an amenable number.

1291285 is a deficient number, since it is larger than the sum of its proper divisors (274211).

1291285 is a wasteful number, since it uses less digits than its factorization.

1291285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2663.

The product of its digits is 1440, while the sum is 28.

The square root of 1291285 is about 1136.3472180632. The cubic root of 1291285 is about 108.8948569469.

The spelling of 1291285 in words is "one million, two hundred ninety-one thousand, two hundred eighty-five".