804913621 has 2 divisors, whose sum is σ = 804913622. Its totient is φ = 804913620.

The previous prime is 804913609. The next prime is 804913633. The reversal of 804913621 is 126319408.

It is a balanced prime because it is at equal distance from previous prime (804913609) and next prime (804913633).

It can be written as a sum of positive squares in only one way, i.e., 659976100 + 144937521 = 25690^2 + 12039^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-804913621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (804913691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402456810 + 402456811.

It is an arithmetic number, because the mean of its divisors is an integer number (402456811).

Almost surely, 2^804913621 is an apocalyptic number.

It is an amenable number.

804913621 is a deficient number, since it is larger than the sum of its proper divisors (1).

804913621 is an equidigital number, since it uses as much as digits as its factorization.

804913621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 804913621 is about 28370.9996475274. Note that the first 3 decimals coincide. The cubic root of 804913621 is about 930.2144728308.

The spelling of 804913621 in words is "eight hundred four million, nine hundred thirteen thousand, six hundred twenty-one".