91050569 has 2 divisors, whose sum is σ = 91050570. Its totient is φ = 91050568.

The previous prime is 91050563. The next prime is 91050577. The reversal of 91050569 is 96505019.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67158025 + 23892544 = 8195^2 + 4888^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91050569 is a prime.

It is a super-2 number, since 2×91050569² = 16580412230447522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91050563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45525284 + 45525285.

It is an arithmetic number, because the mean of its divisors is an integer number (45525285).

Almost surely, 2^91050569 is an apocalyptic number.

It is an amenable number.

91050569 is a deficient number, since it is larger than the sum of its proper divisors (1).

91050569 is an equidigital number, since it uses as much as digits as its factorization.

91050569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12150, while the sum is 35.

The square root of 91050569 is about 9542.0421818393. The cubic root of 91050569 is about 449.8774464620.

It can be divided in two parts, 91050 and 569, that added together give a palindrome (91619).

The spelling of 91050569 in words is "ninety-one million, fifty thousand, five hundred sixty-nine".