91145285 has 32 divisors (see below), whose sum is σ = 138633984. Its totient is φ = 55872000.

The previous prime is 91145281. The next prime is 91145291. The reversal of 91145285 is 58254119.

It is not a de Polignac number, because 91145285 - 2² = 91145281 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91145281) 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 31 ways as a sum of consecutive naturals, for example, 21545 + ... + 25425.

It is an arithmetic number, because the mean of its divisors is an integer number (4332312).

Almost surely, 2^91145285 is an apocalyptic number.

It is an amenable number.

91145285 is a deficient number, since it is larger than the sum of its proper divisors (47488699).

91145285 is a wasteful number, since it uses less digits than its factorization.

91145285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3965.

The product of its digits is 14400, while the sum is 35.

The square root of 91145285 is about 9547.0039803071. The cubic root of 91145285 is about 450.0333884691.

The spelling of 91145285 in words is "ninety-one million, one hundred forty-five thousand, two hundred eighty-five".