90054459991 has 4 divisors (see below), whose sum is σ = 90059595192. Its totient is φ = 90049324792.

The previous prime is 90054459977. The next prime is 90054459997. The reversal of 90054459991 is 19995445009.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 90054459991 - 2⁷ = 90054459863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90054459997) 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, 2541205 + ... + 2576398.

It is an arithmetic number, because the mean of its divisors is an integer number (22514898798).

Almost surely, 2^90054459991 is an apocalyptic number.

90054459991 is a deficient number, since it is larger than the sum of its proper divisors (5135201).

90054459991 is a wasteful number, since it uses less digits than its factorization.

90054459991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5135200.

The product of its (nonzero) digits is 2624400, while the sum is 55.

It can be divided in two parts, 9005 and 4459991, that added together give a square (4468996 = 2114²).

The spelling of 90054459991 in words is "ninety billion, fifty-four million, four hundred fifty-nine thousand, nine hundred ninety-one".