801569 has 2 divisors, whose sum is σ = 801570. Its totient is φ = 801568.

The previous prime is 801557. The next prime is 801571. The reversal of 801569 is 965108.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 620944 + 180625 = 788^2 + 425^2 .

It is a cyclic number.

It is not a de Polignac number, because 801569 - 2¹² = 797473 is a prime.

It is a super-2 number, since 2×801569² = 1285025723522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 801571, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (801539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 400784 + 400785.

It is an arithmetic number, because the mean of its divisors is an integer number (400785).

2⁸⁰¹⁵⁶⁹ is an apocalyptic number.

It is an amenable number.

801569 is a deficient number, since it is larger than the sum of its proper divisors (1).

801569 is an equidigital number, since it uses as much as digits as its factorization.

801569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 801569 is about 895.3038590333. The cubic root of 801569 is about 92.8924258141.

The spelling of 801569 in words is "eight hundred one thousand, five hundred sixty-nine".