91271405471 has 8 divisors (see below), whose sum is σ = 95316749664. Its totient is φ = 87232479840.

The previous prime is 91271405453. The next prime is 91271405473. The reversal of 91271405471 is 17450417219.

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-91271405471 is a prime.

It is a super-3 number, since 3×91271405471³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91271405473) 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 7 ways as a sum of consecutive naturals, for example, 1575560 + ... + 1632461.

It is an arithmetic number, because the mean of its divisors is an integer number (11914593708).

Almost surely, 2^91271405471 is an apocalyptic number.

91271405471 is a deficient number, since it is larger than the sum of its proper divisors (4045344193).

91271405471 is a wasteful number, since it uses less digits than its factorization.

91271405471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3209281.

The product of its (nonzero) digits is 70560, while the sum is 41.

The spelling of 91271405471 in words is "ninety-one billion, two hundred seventy-one million, four hundred five thousand, four hundred seventy-one".