91189975801 has 8 divisors (see below), whose sum is σ = 91715387400. Its totient is φ = 90664801920.

The previous prime is 91189975763. The next prime is 91189975819. The reversal of 91189975801 is 10857998119.

It can be written as a sum of positive squares in 4 ways, for example, as 2816955625 + 88373020176 = 53075^2 + 297276^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91189975801 - 2¹⁷ = 91189844729 is a prime.

It is a super-2 number, since 2×91189975801² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91189975301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 740895 + ... + 855163.

It is an arithmetic number, because the mean of its divisors is an integer number (11464423425).

Almost surely, 2^91189975801 is an apocalyptic number.

It is an amenable number.

91189975801 is a deficient number, since it is larger than the sum of its proper divisors (525411599).

91189975801 is a wasteful number, since it uses less digits than its factorization.

91189975801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118859.

The product of its (nonzero) digits is 1632960, while the sum is 58.

The spelling of 91189975801 in words is "ninety-one billion, one hundred eighty-nine million, nine hundred seventy-five thousand, eight hundred one".