91090008799 has 2 divisors, whose sum is σ = 91090008800. Its totient is φ = 91090008798.

The previous prime is 91090008797. The next prime is 91090008817. The reversal of 91090008799 is 99780009019.

It is a weak prime.

It is an emirp because it is prime and its reverse (99780009019) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91090008799 - 2¹ = 91090008797 is a prime.

Together with 91090008797, 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 (91090008797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45545004399 + 45545004400.

It is an arithmetic number, because the mean of its divisors is an integer number (45545004400).

Almost surely, 2^91090008799 is an apocalyptic number.

91090008799 is a deficient number, since it is larger than the sum of its proper divisors (1).

91090008799 is an equidigital number, since it uses as much as digits as its factorization.

91090008799 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 367416, while the sum is 52.

The spelling of 91090008799 in words is "ninety-one billion, ninety million, eight thousand, seven hundred ninety-nine".