91050661571 has 8 divisors (see below), whose sum is σ = 92195404224. Its totient is φ = 89911866240.

The previous prime is 91050661543. The next prime is 91050661589. The reversal of 91050661571 is 17516605019.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91050661571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91050661531) 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, 1456016 + ... + 1517261.

It is an arithmetic number, because the mean of its divisors is an integer number (11524425528).

Almost surely, 2^91050661571 is an apocalyptic number.

91050661571 is a deficient number, since it is larger than the sum of its proper divisors (1144742653).

91050661571 is a wasteful number, since it uses less digits than its factorization.

91050661571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2973661.

The product of its (nonzero) digits is 56700, while the sum is 41.

The spelling of 91050661571 in words is "ninety-one billion, fifty million, six hundred sixty-one thousand, five hundred seventy-one".