91000454643 has 20 divisors (see below), whose sum is σ = 155358801840. Its totient is φ = 52000259472.

The previous prime is 91000454641. The next prime is 91000454653. The reversal of 91000454643 is 34645400019.

91000454643 is a `hidden beast` number, since 9 + 1 + 0 + 0 + 0 + 4 + 5 + 4 + 643 = 666.

It is not a de Polignac number, because 91000454643 - 2¹ = 91000454641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91000454598 and 91000454607.

It is not an unprimeable number, because it can be changed into a prime (91000454641) 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 19 ways as a sum of consecutive naturals, for example, 80246748 + ... + 80247881.

It is an arithmetic number, because the mean of its divisors is an integer number (7767940092).

Almost surely, 2^91000454643 is an apocalyptic number.

91000454643 is a deficient number, since it is larger than the sum of its proper divisors (64358347197).

91000454643 is a wasteful number, since it uses less digits than its factorization.

91000454643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160494648 (or 160494639 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The spelling of 91000454643 in words is "ninety-one billion, four hundred fifty-four thousand, six hundred forty-three".