91575541 has 4 divisors (see below), whose sum is σ = 91617772. Its totient is φ = 91533312.

The previous prime is 91575527. The next prime is 91575551. The reversal of 91575541 is 14557519.

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 53802225 + 37773316 = 7335^2 + 6146^2 .

It is a cyclic number.

It is not a de Polignac number, because 91575541 - 2¹³ = 91567349 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91575541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91575511) 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, 17676 + ... + 22261.

It is an arithmetic number, because the mean of its divisors is an integer number (22904443).

Almost surely, 2^91575541 is an apocalyptic number.

It is an amenable number.

91575541 is a deficient number, since it is larger than the sum of its proper divisors (42231).

91575541 is a wasteful number, since it uses less digits than its factorization.

91575541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42230.

The product of its digits is 31500, while the sum is 37.

The square root of 91575541 is about 9569.5110115408. The cubic root of 91575541 is about 450.7404123621.

The spelling of 91575541 in words is "ninety-one million, five hundred seventy-five thousand, five hundred forty-one".