90910459091 has 4 divisors (see below), whose sum is σ = 90913976184. Its totient is φ = 90906942000.

The previous prime is 90910459051. The next prime is 90910459121. The reversal of 90910459091 is 19095401909.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19095401909 = 47 ⋅406285147.

It is a cyclic number.

It is not a de Polignac number, because 90910459091 - 2⁶ = 90910459027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90910459001) 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 in 3 ways as a sum of consecutive naturals, for example, 1719485 + ... + 1771566.

It is an arithmetic number, because the mean of its divisors is an integer number (22728494046).

Almost surely, 2^90910459091 is an apocalyptic number.

90910459091 is a deficient number, since it is larger than the sum of its proper divisors (3517093).

90910459091 is a wasteful number, since it uses less digits than its factorization.

90910459091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3517092.

The product of its (nonzero) digits is 131220, while the sum is 47.

The spelling of 90910459091 in words is "ninety billion, nine hundred ten million, four hundred fifty-nine thousand, ninety-one".