91647436271 has 4 divisors (see below), whose sum is σ = 97038461952. Its totient is φ = 86256410592.

The previous prime is 91647436247. The next prime is 91647436277. The reversal of 91647436271 is 17263474619.

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

It is a cyclic number.

It is not a de Polignac number, because 91647436271 - 2¹⁰ = 91647435247 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 (91647436277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2695512815 + ... + 2695512848.

It is an arithmetic number, because the mean of its divisors is an integer number (24259615488).

Almost surely, 2^91647436271 is an apocalyptic number.

91647436271 is a deficient number, since it is larger than the sum of its proper divisors (5391025681).

91647436271 is a wasteful number, since it uses less digits than its factorization.

91647436271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5391025680.

The product of its digits is 1524096, while the sum is 50.

The spelling of 91647436271 in words is "ninety-one billion, six hundred forty-seven million, four hundred thirty-six thousand, two hundred seventy-one".