91235565697 has 4 divisors (see below), whose sum is σ = 91236352960. Its totient is φ = 91234778436.

The previous prime is 91235565683. The next prime is 91235565727. The reversal of 91235565697 is 79656553219.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 79656553219 = 593 ⋅134328083.

It is a cyclic number.

It is not a de Polignac number, because 91235565697 - 2¹⁹ = 91235041409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91235565647) 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, 181797 + ... + 464242.

It is an arithmetic number, because the mean of its divisors is an integer number (22809088240).

Almost surely, 2^91235565697 is an apocalyptic number.

It is an amenable number.

91235565697 is a deficient number, since it is larger than the sum of its proper divisors (787263).

91235565697 is a wasteful number, since it uses less digits than its factorization.

91235565697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 787262.

The product of its digits is 15309000, while the sum is 58.

The spelling of 91235565697 in words is "ninety-one billion, two hundred thirty-five million, five hundred sixty-five thousand, six hundred ninety-seven".