804891001 has 2 divisors, whose sum is σ = 804891002. Its totient is φ = 804891000.

The previous prime is 804890953. The next prime is 804891013. The reversal of 804891001 is 100198408.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 539168400 + 265722601 = 23220^2 + 16301^2 .

It is a cyclic number.

It is not a de Polignac number, because 804891001 - 2⁷ = 804890873 is a prime.

It is equal to p_41384830 and since 804891001 and 41384830 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (804891041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402445500 + 402445501.

It is an arithmetic number, because the mean of its divisors is an integer number (402445501).

Almost surely, 2^804891001 is an apocalyptic number.

It is an amenable number.

804891001 is a deficient number, since it is larger than the sum of its proper divisors (1).

804891001 is an equidigital number, since it uses as much as digits as its factorization.

804891001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 804891001 is about 28370.6009982164. The cubic root of 804891001 is about 930.2057589978.

The spelling of 804891001 in words is "eight hundred four million, eight hundred ninety-one thousand, one".