811491 has 8 divisors (see below), whose sum is σ = 1095360. Its totient is φ = 534312.

The previous prime is 811469. The next prime is 811493. The reversal of 811491 is 194118.

811491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 811491 - 2¹¹ = 809443 is a prime.

811491 is a lucky number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (811493) 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, 1381 + ... + 1878.

It is an arithmetic number, because the mean of its divisors is an integer number (136920).

2⁸¹¹⁴⁹¹ is an apocalyptic number.

811491 is a deficient number, since it is larger than the sum of its proper divisors (283869).

811491 is a wasteful number, since it uses less digits than its factorization.

811491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3345.

The product of its digits is 288, while the sum is 24.

The square root of 811491 is about 900.8279524970. The cubic root of 811491 is about 93.2741362147.

The spelling of 811491 in words is "eight hundred eleven thousand, four hundred ninety-one".