91542524791 has 4 divisors (see below), whose sum is σ = 91562653000. Its totient is φ = 91522396584.

The previous prime is 91542524737. The next prime is 91542524809. The reversal of 91542524791 is 19742524519.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19742524519 = 8693 ⋅2271083.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91542524791 is a prime.

It is a super-2 number, since 2×91542524791² (a number of 23 digits) contains 22 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 (91542224791) 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, 10057281 + ... + 10066378.

It is an arithmetic number, because the mean of its divisors is an integer number (22890663250).

Almost surely, 2^91542524791 is an apocalyptic number.

91542524791 is a deficient number, since it is larger than the sum of its proper divisors (20128209).

91542524791 is a wasteful number, since it uses less digits than its factorization.

91542524791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20128208.

The product of its digits is 907200, while the sum is 49.

The spelling of 91542524791 in words is "ninety-one billion, five hundred forty-two million, five hundred twenty-four thousand, seven hundred ninety-one".