91001745 has 32 divisors (see below), whose sum is σ = 164211840. Its totient is φ = 47805120.

The previous prime is 91001741. The next prime is 91001747. The reversal of 91001745 is 54710019.

It is not a de Polignac number, because 91001745 - 2² = 91001741 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (91001741) 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, 4015 + ... + 14075.

It is an arithmetic number, because the mean of its divisors is an integer number (5131620).

Almost surely, 2^91001745 is an apocalyptic number.

It is an amenable number.

91001745 is a deficient number, since it is larger than the sum of its proper divisors (73210095).

91001745 is a wasteful number, since it uses less digits than its factorization.

91001745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10142 (or 10136 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

The square root of 91001745 is about 9539.4834765830. The cubic root of 91001745 is about 449.7970195670.

The spelling of 91001745 in words is "ninety-one million, one thousand, seven hundred forty-five".