1291085 has 8 divisors (see below), whose sum is σ = 1560600. Its totient is φ = 1025344.

The previous prime is 1291079. The next prime is 1291111. The reversal of 1291085 is 5801921.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7396 + 1283689 = 86^2 + 1133^2 .

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 1291085 - 2⁶ = 1291021 is a prime.

It is a Curzon 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, 122 + ... + 1611.

It is an arithmetic number, because the mean of its divisors is an integer number (195075).

2^1291085 is an apocalyptic number.

It is an amenable number.

1291085 is a deficient number, since it is larger than the sum of its proper divisors (269515).

1291085 is a wasteful number, since it uses less digits than its factorization.

1291085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1887.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 1291085 is about 1136.2592133840. The cubic root of 1291085 is about 108.8892346157.

The spelling of 1291085 in words is "one million, two hundred ninety-one thousand, eighty-five".