91090008901 has 2 divisors, whose sum is σ = 91090008902. Its totient is φ = 91090008900.

The previous prime is 91090008899. The next prime is 91090008913. The reversal of 91090008901 is 10980009019.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85045723876 + 6044285025 = 291626^2 + 77745^2 .

It is a cyclic number.

It is not a de Polignac number, because 91090008901 - 2¹ = 91090008899 is a prime.

Together with 91090008899, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91090008941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45545004450 + 45545004451.

It is an arithmetic number, because the mean of its divisors is an integer number (45545004451).

Almost surely, 2^91090008901 is an apocalyptic number.

It is an amenable number.

91090008901 is a deficient number, since it is larger than the sum of its proper divisors (1).

91090008901 is an equidigital number, since it uses as much as digits as its factorization.

91090008901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 37.

The spelling of 91090008901 in words is "ninety-one billion, ninety million, eight thousand, nine hundred one".