91036789 has 4 divisors (see below), whose sum is σ = 91060000. Its totient is φ = 91013580.

The previous prime is 91036753. The next prime is 91036811. The reversal of 91036789 is 98763019.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 91036789 - 2¹⁹ = 90512501 is a prime.

It is a Duffinian number.

It is a congruent number.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4107 + ... + 14104.

It is an arithmetic number, because the mean of its divisors is an integer number (22765000).

Almost surely, 2^91036789 is an apocalyptic number.

It is an amenable number.

91036789 is a deficient number, since it is larger than the sum of its proper divisors (23211).

91036789 is a wasteful number, since it uses less digits than its factorization.

91036789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23210.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 91036789 is about 9541.3200868643. The cubic root of 91036789 is about 449.8547498293.

The spelling of 91036789 in words is "ninety-one million, thirty-six thousand, seven hundred eighty-nine".