91000454647 has 16 divisors (see below), whose sum is σ = 100355814400. Its totient is φ = 82184699520.

The previous prime is 91000454641. The next prime is 91000454653. The reversal of 91000454647 is 74645400019.

It is an interprime number because it is at equal distance from previous prime (91000454641) and next prime (91000454653).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91000454647 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 (91000454641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1113522 + ... + 1192447.

It is an arithmetic number, because the mean of its divisors is an integer number (6272238400).

Almost surely, 2^91000454647 is an apocalyptic number.

91000454647 is a deficient number, since it is larger than the sum of its proper divisors (9355359753).

91000454647 is a wasteful number, since it uses less digits than its factorization.

91000454647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2306086.

The product of its (nonzero) digits is 120960, while the sum is 40.

The spelling of 91000454647 in words is "ninety-one billion, four hundred fifty-four thousand, six hundred forty-seven".