91240145 has 8 divisors (see below), whose sum is σ = 110988456. Its totient is φ = 71991936.

The previous prime is 91240141. The next prime is 91240159. The reversal of 91240145 is 54104219.

It can be written as a sum of positive squares in 4 ways, for example, as 15062161 + 76177984 = 3881^2 + 8728^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91240145 - 2² = 91240141 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91240141) 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 7 ways as a sum of consecutive naturals, for example, 124622 + ... + 125351.

It is an arithmetic number, because the mean of its divisors is an integer number (13873557).

Almost surely, 2^91240145 is an apocalyptic number.

It is an amenable number.

91240145 is a deficient number, since it is larger than the sum of its proper divisors (19748311).

91240145 is a wasteful number, since it uses less digits than its factorization.

91240145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250051.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 91240145 is about 9551.9707390674. The cubic root of 91240145 is about 450.1894593172.

The spelling of 91240145 in words is "ninety-one million, two hundred forty thousand, one hundred forty-five".