1288491 has 4 divisors (see below), whose sum is σ = 1717992. Its totient is φ = 858992.

The previous prime is 1288487. The next prime is 1288513. The reversal of 1288491 is 1948821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1288491 - 2² = 1288487 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (1288421) 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, 214746 + ... + 214751.

It is an arithmetic number, because the mean of its divisors is an integer number (429498).

2^1288491 is an apocalyptic number.

1288491 is a deficient number, since it is larger than the sum of its proper divisors (429501).

1288491 is an equidigital number, since it uses as much as digits as its factorization.

1288491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429500.

The product of its digits is 4608, while the sum is 33.

The square root of 1288491 is about 1135.1171745683. The cubic root of 1288491 is about 108.8162603203.

The spelling of 1288491 in words is "one million, two hundred eighty-eight thousand, four hundred ninety-one".