91279475757 has 24 divisors (see below), whose sum is σ = 140936298048. Its totient is φ = 56787508800.

The previous prime is 91279475737. The next prime is 91279475869. The reversal of 91279475757 is 75757497219.

91279475757 is a `hidden beast` number, since 9 + 12 + 7 + 9 + 47 + 575 + 7 = 666.

It is not a de Polignac number, because 91279475757 - 2¹⁴ = 91279459373 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91279475694 and 91279475703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91279475737) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5369119 + ... + 5386092.

It is an arithmetic number, because the mean of its divisors is an integer number (5872345752).

Almost surely, 2^91279475757 is an apocalyptic number.

It is an amenable number.

91279475757 is a deficient number, since it is larger than the sum of its proper divisors (49656822291).

91279475757 is a wasteful number, since it uses less digits than its factorization.

91279475757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10755281 (or 10755278 counting only the distinct ones).

The product of its digits is 38896200, while the sum is 63.

The spelling of 91279475757 in words is "ninety-one billion, two hundred seventy-nine million, four hundred seventy-five thousand, seven hundred fifty-seven".