91570986559891 has 8 divisors (see below), whose sum is σ = 91655849938464. Its totient is φ = 91486125714240.

The previous prime is 91570986559889. The next prime is 91570986559901. The reversal of 91570986559891 is 19895568907519.

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

It is a cyclic number.

It is not a de Polignac number, because 91570986559891 - 2¹ = 91570986559889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91570986559831) 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, 75995866 + ... + 77191408.

It is an arithmetic number, because the mean of its divisors is an integer number (11456981242308).

Almost surely, 2^{91570986559891} is an apocalyptic number.

91570986559891 is a deficient number, since it is larger than the sum of its proper divisors (84863378573).

91570986559891 is a wasteful number, since it uses less digits than its factorization.

91570986559891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1266461.

The product of its (nonzero) digits is 2204496000, while the sum is 82.

The spelling of 91570986559891 in words is "ninety-one trillion, five hundred seventy billion, nine hundred eighty-six million, five hundred fifty-nine thousand, eight hundred ninety-one".