91540265 has 4 divisors (see below), whose sum is σ = 109848324. Its totient is φ = 73232208.

The previous prime is 91540261. The next prime is 91540297. The reversal of 91540265 is 56204519.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 57714409 + 33825856 = 7597^2 + 5816^2 .

It is a cyclic number.

It is not a de Polignac number, because 91540265 - 2² = 91540261 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91540261) 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, 9154022 + ... + 9154031.

It is an arithmetic number, because the mean of its divisors is an integer number (27462081).

Almost surely, 2^91540265 is an apocalyptic number.

It is an amenable number.

91540265 is a deficient number, since it is larger than the sum of its proper divisors (18308059).

91540265 is a wasteful number, since it uses less digits than its factorization.

91540265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18308058.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 91540265 is about 9567.6676886272. The cubic root of 91540265 is about 450.6825280525.

The spelling of 91540265 in words is "ninety-one million, five hundred forty thousand, two hundred sixty-five".