91044765 has 24 divisors (see below), whose sum is σ = 180355968. Its totient is φ = 41620320.

The previous prime is 91044761. The next prime is 91044773. The reversal of 91044765 is 56744019.

It is not a de Polignac number, because 91044765 - 2² = 91044761 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91044761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 144201 + ... + 144830.

It is an arithmetic number, because the mean of its divisors is an integer number (7514832).

Almost surely, 2^91044765 is an apocalyptic number.

It is an amenable number.

91044765 is a deficient number, since it is larger than the sum of its proper divisors (89311203).

91044765 is a wasteful number, since it uses less digits than its factorization.

91044765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289049 (or 289046 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 91044765 is about 9541.7380492235. The cubic root of 91044765 is about 449.8678871435.

It can be divided in two parts, 91044 and 765, that added together give a square (91809 = 303²).

The spelling of 91044765 in words is "ninety-one million, forty-four thousand, seven hundred sixty-five".