91442909 has 2 divisors, whose sum is σ = 91442910. Its totient is φ = 91442908.

The previous prime is 91442903. The next prime is 91442929. The reversal of 91442909 is 90924419.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75864100 + 15578809 = 8710^2 + 3947^2 .

It is a cyclic number.

It is not a de Polignac number, because 91442909 - 2⁴ = 91442893 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91442903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45721454 + 45721455.

It is an arithmetic number, because the mean of its divisors is an integer number (45721455).

Almost surely, 2^91442909 is an apocalyptic number.

It is an amenable number.

91442909 is a deficient number, since it is larger than the sum of its proper divisors (1).

91442909 is an equidigital number, since it uses as much as digits as its factorization.

91442909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 91442909 is about 9562.5785748406. The cubic root of 91442909 is about 450.5226996166.

The spelling of 91442909 in words is "ninety-one million, four hundred forty-two thousand, nine hundred nine".