91036769 has 4 divisors (see below), whose sum is σ = 93257220. Its totient is φ = 88816320.

The previous prime is 91036753. The next prime is 91036811. The reversal of 91036769 is 96763019.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1488400 + 89548369 = 1220^2 + 9463^2 .

It is a cyclic number.

It is not a de Polignac number, because 91036769 - 2⁴ = 91036753 is a prime.

It is a super-2 number, since 2×91036769² = 16575386619918722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 2220409 = 91036769 / (9 + 1 + 0 + 3 + 6 + 7 + 6 + 9).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (91036709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1110164 + ... + 1110245.

It is an arithmetic number, because the mean of its divisors is an integer number (23314305).

Almost surely, 2^91036769 is an apocalyptic number.

It is an amenable number.

91036769 is a deficient number, since it is larger than the sum of its proper divisors (2220451).

91036769 is a wasteful number, since it uses less digits than its factorization.

91036769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2220450.

The product of its (nonzero) digits is 61236, while the sum is 41.

The square root of 91036769 is about 9541.3190387912. The cubic root of 91036769 is about 449.8547168862.

The spelling of 91036769 in words is "ninety-one million, thirty-six thousand, seven hundred sixty-nine".