809492491 has 4 divisors (see below), whose sum is σ = 835605184. Its totient is φ = 783379800.

The previous prime is 809492483. The next prime is 809492527. The reversal of 809492491 is 194294908.

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 809492491 - 2³ = 809492483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (809492441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13056300 + ... + 13056361.

It is an arithmetic number, because the mean of its divisors is an integer number (208901296).

Almost surely, 2^809492491 is an apocalyptic number.

809492491 is a deficient number, since it is larger than the sum of its proper divisors (26112693).

809492491 is a wasteful number, since it uses less digits than its factorization.

809492491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26112692.

The product of its (nonzero) digits is 186624, while the sum is 46.

The square root of 809492491 is about 28451.5815201897. The cubic root of 809492491 is about 931.9750261165.

The spelling of 809492491 in words is "eight hundred nine million, four hundred ninety-two thousand, four hundred ninety-one".