804491549 has 2 divisors, whose sum is σ = 804491550. Its totient is φ = 804491548.

The previous prime is 804491543. The next prime is 804491593. The reversal of 804491549 is 945194408.

It is an a-pointer prime, because the next prime (804491593) can be obtained adding 804491549 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 804119449 + 372100 = 28357^2 + 610^2 .

It is a cyclic number.

It is not a de Polignac number, because 804491549 - 2¹⁶ = 804426013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (804491543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402245774 + 402245775.

It is an arithmetic number, because the mean of its divisors is an integer number (402245775).

Almost surely, 2^804491549 is an apocalyptic number.

It is an amenable number.

804491549 is a deficient number, since it is larger than the sum of its proper divisors (1).

804491549 is an equidigital number, since it uses as much as digits as its factorization.

804491549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 207360, while the sum is 44.

The square root of 804491549 is about 28363.5602313955. The cubic root of 804491549 is about 930.0518524294.

The spelling of 804491549 in words is "eight hundred four million, four hundred ninety-one thousand, five hundred forty-nine".