91260145 has 4 divisors (see below), whose sum is σ = 109512180. Its totient is φ = 73008112.

The previous prime is 91260139. The next prime is 91260149. The reversal of 91260145 is 54106219.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54106219 = 6911 ⋅7829.

It can be written as a sum of positive squares in 2 ways, for example, as 13890529 + 77369616 = 3727^2 + 8796^2 .

It is a cyclic number.

It is not a de Polignac number, because 91260145 - 2¹⁵ = 91227377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91260149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9126010 + ... + 9126019.

It is an arithmetic number, because the mean of its divisors is an integer number (27378045).

Almost surely, 2^91260145 is an apocalyptic number.

It is an amenable number.

91260145 is a deficient number, since it is larger than the sum of its proper divisors (18252035).

91260145 is a wasteful number, since it uses less digits than its factorization.

91260145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18252034.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 91260145 is about 9553.0175860824. The cubic root of 91260145 is about 450.2223510206. Note that the first 3 decimals are identical.

The spelling of 91260145 in words is "ninety-one million, two hundred sixty thousand, one hundred forty-five".