91822009 has 2 divisors, whose sum is σ = 91822010. Its totient is φ = 91822008.

The previous prime is 91821997. The next prime is 91822013. The reversal of 91822009 is 90022819.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89870400 + 1951609 = 9480^2 + 1397^2 .

It is a cyclic number.

It is not a de Polignac number, because 91822009 - 2¹¹ = 91819961 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91822039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45911004 + 45911005.

It is an arithmetic number, because the mean of its divisors is an integer number (45911005).

Almost surely, 2^91822009 is an apocalyptic number.

It is an amenable number.

91822009 is a deficient number, since it is larger than the sum of its proper divisors (1).

91822009 is an equidigital number, since it uses as much as digits as its factorization.

91822009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 91822009 is about 9582.3801323053. The cubic root of 91822009 is about 451.1444269769.

The spelling of 91822009 in words is "ninety-one million, eight hundred twenty-two thousand, nine".