804491781 has 4 divisors (see below), whose sum is σ = 1072655712. Its totient is φ = 536327852.

The previous prime is 804491771. The next prime is 804491783. The reversal of 804491781 is 187194408.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 804491781 - 2⁹ = 804491269 is a prime.

It is a super-2 number, since 2×804491781² = 1294414051393103922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (804491783) 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, 134081961 + ... + 134081966.

It is an arithmetic number, because the mean of its divisors is an integer number (268163928).

Almost surely, 2^804491781 is an apocalyptic number.

It is an amenable number.

804491781 is a deficient number, since it is larger than the sum of its proper divisors (268163931).

804491781 is a wasteful number, since it uses less digits than its factorization.

804491781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268163930.

The product of its (nonzero) digits is 64512, while the sum is 42.

The square root of 804491781 is about 28363.5643211498. The cubic root of 804491781 is about 930.0519418324.

The spelling of 804491781 in words is "eight hundred four million, four hundred ninety-one thousand, seven hundred eighty-one".