804627981 has 6 divisors (see below), whose sum is σ = 1162240430. Its totient is φ = 536418648.

The previous prime is 804627977. The next prime is 804628007. The reversal of 804627981 is 189726408.

It can be written as a sum of positive squares in only one way, i.e., 804573225 + 54756 = 28365^2 + 234^2 .

It is not a de Polignac number, because 804627981 - 2² = 804627977 is a prime.

It is a super-2 number, since 2×804627981² = 1294852375616272722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (804622981) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 44701546 + ... + 44701563.

Almost surely, 2^804627981 is an apocalyptic number.

It is an amenable number.

804627981 is a deficient number, since it is larger than the sum of its proper divisors (357612449).

804627981 is a wasteful number, since it uses less digits than its factorization.

804627981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89403115 (or 89403112 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 804627981 is about 28365.9651871746. The cubic root of 804627981 is about 930.1044246253.

The spelling of 804627981 in words is "eight hundred four million, six hundred twenty-seven thousand, nine hundred eighty-one".