91275644071 has 4 divisors (see below), whose sum is σ = 93398333512. Its totient is φ = 89152954632.

The previous prime is 91275643981. The next prime is 91275644077. The reversal of 91275644071 is 17044657219.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17044657219 = 23 ⋅741072053.

It is a cyclic number.

It is not a de Polignac number, because 91275644071 - 2¹³ = 91275635879 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 (91275644077) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1061344656 + ... + 1061344741.

It is an arithmetic number, because the mean of its divisors is an integer number (23349583378).

Almost surely, 2^91275644071 is an apocalyptic number.

91275644071 is a deficient number, since it is larger than the sum of its proper divisors (2122689441).

91275644071 is a wasteful number, since it uses less digits than its factorization.

91275644071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2122689440.

The product of its (nonzero) digits is 423360, while the sum is 46.

The spelling of 91275644071 in words is "ninety-one billion, two hundred seventy-five million, six hundred forty-four thousand, seventy-one".