91508145 has 16 divisors (see below), whose sum is σ = 152779392. Its totient is φ = 46682240.

The previous prime is 91508143. The next prime is 91508167. The reversal of 91508145 is 54180519.

It is not a de Polignac number, because 91508145 - 2¹ = 91508143 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (91508143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132276 + ... + 132965.

It is an arithmetic number, because the mean of its divisors is an integer number (9548712).

Almost surely, 2^91508145 is an apocalyptic number.

It is an amenable number.

91508145 is a deficient number, since it is larger than the sum of its proper divisors (61271247).

91508145 is a wasteful number, since it uses less digits than its factorization.

91508145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265272.

The product of its (nonzero) digits is 7200, while the sum is 33.

The square root of 91508145 is about 9565.9889713505. The cubic root of 91508145 is about 450.6298094802.

The spelling of 91508145 in words is "ninety-one million, five hundred eight thousand, one hundred forty-five".