91705079751 has 4 divisors (see below), whose sum is σ = 122273439672. Its totient is φ = 61136719832.

The previous prime is 91705079747. The next prime is 91705079813. The reversal of 91705079751 is 15797050719.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15797050719 = 3 ⋅5265683573.

It is a cyclic number.

It is not a de Polignac number, because 91705079751 - 2² = 91705079747 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91705079694 and 91705079703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91705079651) 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, 15284179956 + ... + 15284179961.

It is an arithmetic number, because the mean of its divisors is an integer number (30568359918).

Almost surely, 2^91705079751 is an apocalyptic number.

91705079751 is a deficient number, since it is larger than the sum of its proper divisors (30568359921).

91705079751 is a wasteful number, since it uses less digits than its factorization.

91705079751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30568359920.

The product of its (nonzero) digits is 694575, while the sum is 51.

The spelling of 91705079751 in words is "ninety-one billion, seven hundred five million, seventy-nine thousand, seven hundred fifty-one".