4091569 has 2 divisors, whose sum is σ = 4091570. Its totient is φ = 4091568.

The previous prime is 4091561. The next prime is 4091587. The reversal of 4091569 is 9651904.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2496400 + 1595169 = 1580^2 + 1263^2 .

It is a cyclic number.

It is not a de Polignac number, because 4091569 - 2³ = 4091561 is a prime.

It is a super-2 number, since 2×4091569² = 33481873763522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (4091561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2045784 + 2045785.

It is an arithmetic number, because the mean of its divisors is an integer number (2045785).

Almost surely, 2^4091569 is an apocalyptic number.

It is an amenable number.

4091569 is a deficient number, since it is larger than the sum of its proper divisors (1).

4091569 is an equidigital number, since it uses as much as digits as its factorization.

4091569 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 4091569 is about 2022.7627147048. The cubic root of 4091569 is about 159.9422838703.

The spelling of 4091569 in words is "four million, ninety-one thousand, five hundred sixty-nine".