91936638202 has 4 divisors (see below), whose sum is σ = 137904957306. Its totient is φ = 45968319100.

The previous prime is 91936638193. The next prime is 91936638229. The reversal of 91936638202 is 20283663919.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20283663919 = 83 ⋅244381493.

It can be written as a sum of positive squares in only one way, i.e., 88588974321 + 3347663881 = 297639^2 + 57859^2 .

It is a Smith number, since the sum of its digits (49) 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, 22984159549 + ... + 22984159552.

Almost surely, 2^91936638202 is an apocalyptic number.

91936638202 is a deficient number, since it is larger than the sum of its proper divisors (45968319104).

91936638202 is a wasteful number, since it uses less digits than its factorization.

91936638202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45968319103.

The product of its (nonzero) digits is 839808, while the sum is 49.

The spelling of 91936638202 in words is "ninety-one billion, nine hundred thirty-six million, six hundred thirty-eight thousand, two hundred two".