91841760561 has 8 divisors (see below), whose sum is σ = 122622744640. Its totient is φ = 61144308432.

The previous prime is 91841760539. The next prime is 91841760583. The reversal of 91841760561 is 16506714819.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (91841760539) and next prime (91841760583).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91841760561 - 2⁷ = 91841760433 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 91841760561.

It is not an unprimeable number, because it can be changed into a prime (91841760061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20880421 + ... + 20884818.

It is an arithmetic number, because the mean of its divisors is an integer number (15327843080).

Almost surely, 2^91841760561 is an apocalyptic number.

It is an amenable number.

91841760561 is a deficient number, since it is larger than the sum of its proper divisors (30780984079).

91841760561 is a wasteful number, since it uses less digits than its factorization.

91841760561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41765975.

The product of its (nonzero) digits is 362880, while the sum is 48.

The spelling of 91841760561 in words is "ninety-one billion, eight hundred forty-one million, seven hundred sixty thousand, five hundred sixty-one".