91286927338 has 4 divisors (see below), whose sum is σ = 136930391010. Its totient is φ = 45643463668.

The previous prime is 91286927327. The next prime is 91286927399. The reversal of 91286927338 is 83372968219.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83372968219 = 83 ⋅1004493593.

It can be written as a sum of positive squares in only one way, i.e., 51671199969 + 39615727369 = 227313^2 + 199037^2 .

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22821731833 + ... + 22821731836.

Almost surely, 2^91286927338 is an apocalyptic number.

91286927338 is a deficient number, since it is larger than the sum of its proper divisors (45643463672).

91286927338 is a wasteful number, since it uses less digits than its factorization.

91286927338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45643463671.

The product of its digits is 7838208, while the sum is 58.

The spelling of 91286927338 in words is "ninety-one billion, two hundred eighty-six million, nine hundred twenty-seven thousand, three hundred thirty-eight".