91356981169 has 8 divisors (see below), whose sum is σ = 92868429800. Its totient is φ = 89845977600.

The previous prime is 91356981167. The next prime is 91356981187. The reversal of 91356981169 is 96118965319.

It can be written as a sum of positive squares in 4 ways, for example, as 34591536144 + 56765445025 = 185988^2 + 238255^2 .

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 91356981169 - 2¹ = 91356981167 is a prime.

It is a super-3 number, since 3×91356981169³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91356981167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 316129 + ... + 531649.

It is an arithmetic number, because the mean of its divisors is an integer number (11608553725).

Almost surely, 2^91356981169 is an apocalyptic number.

It is an amenable number.

91356981169 is a deficient number, since it is larger than the sum of its proper divisors (1511448631).

91356981169 is a wasteful number, since it uses less digits than its factorization.

91356981169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222531.

The product of its digits is 3149280, while the sum is 58.

The spelling of 91356981169 in words is "ninety-one billion, three hundred fifty-six million, nine hundred eighty-one thousand, one hundred sixty-nine".