91786579369 has 27 divisors (see below), whose sum is σ = 98518506021. Its totient is φ = 85508277120.

The previous prime is 91786579351. The next prime is 91786579399. The reversal of 91786579369 is 96397568719.

The square root of 91786579369 is 302963.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 4177683225 + 87608896144 = 64635^2 + 295988^2 .

It is not a de Polignac number, because 91786579369 - 2¹⁵ = 91786546601 is a prime.

It is a super-2 number, since 2×91786579369² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91786579298 and 91786579307.

It is not an unprimeable number, because it can be changed into a prime (91786579309) 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 26 ways as a sum of consecutive naturals, for example, 272363569 + ... + 272363905.

Almost surely, 2^91786579369 is an apocalyptic number.

91786579369 is the 302963-rd square number.

91786579369 is the 151482-nd centered octagonal number.

It is an amenable number.

91786579369 is a deficient number, since it is larger than the sum of its proper divisors (6731926652).

91786579369 is an frugal number, since it uses more digits than its factorization.

91786579369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794 (or 397 counting only the distinct ones).

The product of its digits is 154314720, while the sum is 70.

The spelling of 91786579369 in words is "ninety-one billion, seven hundred eighty-six million, five hundred seventy-nine thousand, three hundred sixty-nine".