91000454649 has 32 divisors (see below), whose sum is σ = 135084749184. Its totient is φ = 54133954560.

The previous prime is 91000454641. The next prime is 91000454653. The reversal of 91000454649 is 94645400019.

It is not a de Polignac number, because 91000454649 - 2³ = 91000454641 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91000454649.

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 31 ways as a sum of consecutive naturals, for example, 117042 + ... + 442379.

It is an arithmetic number, because the mean of its divisors is an integer number (4221398412).

Almost surely, 2^91000454649 is an apocalyptic number.

It is an amenable number.

91000454649 is a deficient number, since it is larger than the sum of its proper divisors (44084294535).

91000454649 is a wasteful number, since it uses less digits than its factorization.

91000454649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559577.

The product of its (nonzero) digits is 155520, while the sum is 42.

The spelling of 91000454649 in words is "ninety-one billion, four hundred fifty-four thousand, six hundred forty-nine".