91372167517 has 4 divisors (see below), whose sum is σ = 93841685596. Its totient is φ = 88902649440.

The previous prime is 91372167503. The next prime is 91372167553. The reversal of 91372167517 is 71576127319.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 78407840196 + 12964327321 = 280014^2 + 113861^2 .

It is a cyclic number.

It is not a de Polignac number, because 91372167517 - 2⁷ = 91372167389 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 (91372167577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1234758984 + ... + 1234759057.

It is an arithmetic number, because the mean of its divisors is an integer number (23460421399).

Almost surely, 2^91372167517 is an apocalyptic number.

It is an amenable number.

91372167517 is a deficient number, since it is larger than the sum of its proper divisors (2469518079).

91372167517 is a wasteful number, since it uses less digits than its factorization.

91372167517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2469518078.

The product of its digits is 555660, while the sum is 49.

The spelling of 91372167517 in words is "ninety-one billion, three hundred seventy-two million, one hundred sixty-seven thousand, five hundred seventeen".