91771162071 has 4 divisors (see below), whose sum is σ = 122361549432. Its totient is φ = 61180774712.

The previous prime is 91771162013. The next prime is 91771162073. The reversal of 91771162071 is 17026117719.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91771162071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91771162073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15295193676 + ... + 15295193681.

It is an arithmetic number, because the mean of its divisors is an integer number (30590387358).

Almost surely, 2^91771162071 is an apocalyptic number.

91771162071 is a deficient number, since it is larger than the sum of its proper divisors (30590387361).

91771162071 is a wasteful number, since it uses less digits than its factorization.

91771162071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30590387360.

The product of its (nonzero) digits is 37044, while the sum is 42.

The spelling of 91771162071 in words is "ninety-one billion, seven hundred seventy-one million, one hundred sixty-two thousand, seventy-one".