801491 has 4 divisors (see below), whose sum is σ = 818592. Its totient is φ = 784392.

The previous prime is 801487. The next prime is 801503. The reversal of 801491 is 194108.

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 801491 - 2² = 801487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (801421) 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, 8480 + ... + 8573.

It is an arithmetic number, because the mean of its divisors is an integer number (204648).

2⁸⁰¹⁴⁹¹ is an apocalyptic number.

801491 is a deficient number, since it is larger than the sum of its proper divisors (17101).

801491 is a wasteful number, since it uses less digits than its factorization.

801491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17100.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 801491 is about 895.2602973437. The cubic root of 801491 is about 92.8894126220.

Adding to 801491 its reverse (194108), we get a palindrome (995599).

The spelling of 801491 in words is "eight hundred one thousand, four hundred ninety-one".