9091561 has 2 divisors, whose sum is σ = 9091562. Its totient is φ = 9091560.

The previous prime is 9091553. The next prime is 9091591. The reversal of 9091561 is 1651909.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5851561 + 3240000 = 2419^2 + 1800^2 .

It is a cyclic number.

It is not a de Polignac number, because 9091561 - 2³ = 9091553 is a prime.

It is not a weakly prime, because it can be changed into another prime (9091541) 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, 4545780 + 4545781.

It is an arithmetic number, because the mean of its divisors is an integer number (4545781).

Almost surely, 2^9091561 is an apocalyptic number.

It is an amenable number.

9091561 is a deficient number, since it is larger than the sum of its proper divisors (1).

9091561 is an equidigital number, since it uses as much as digits as its factorization.

9091561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2430, while the sum is 31.

The square root of 9091561 is about 3015.2215507322. The cubic root of 9091561 is about 208.7113909018.

The spelling of 9091561 in words is "nine million, ninety-one thousand, five hundred sixty-one".