91792081385 has 4 divisors (see below), whose sum is σ = 110150497668. Its totient is φ = 73433665104.

The previous prime is 91792081361. The next prime is 91792081387. The reversal of 91792081385 is 58318029719.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58318029719 = 110879 ⋅525961.

It can be written as a sum of positive squares in 2 ways, for example, as 38406592576 + 53385488809 = 195976^2 + 231053^2 .

It is a cyclic number.

It is not a de Polignac number, because 91792081385 - 2¹⁰ = 91792080361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91792081387) 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 3 ways as a sum of consecutive naturals, for example, 9179208134 + ... + 9179208143.

It is an arithmetic number, because the mean of its divisors is an integer number (27537624417).

Almost surely, 2^91792081385 is an apocalyptic number.

It is an amenable number.

91792081385 is a deficient number, since it is larger than the sum of its proper divisors (18358416283).

91792081385 is a wasteful number, since it uses less digits than its factorization.

91792081385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18358416282.

The product of its (nonzero) digits is 1088640, while the sum is 53.

The spelling of 91792081385 in words is "ninety-one billion, seven hundred ninety-two million, eighty-one thousand, three hundred eighty-five".