45540521 has 4 divisors (see below), whose sum is σ = 49043652. Its totient is φ = 42037392.

The previous prime is 45540497. The next prime is 45540533. The reversal of 45540521 is 12504554.

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 20430400 + 25110121 = 4520^2 + 5011^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-45540521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (45540571) 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, 1751546 + ... + 1751571.

It is an arithmetic number, because the mean of its divisors is an integer number (12260913).

Almost surely, 2^45540521 is an apocalyptic number.

It is an amenable number.

45540521 is a deficient number, since it is larger than the sum of its proper divisors (3503131).

45540521 is a wasteful number, since it uses less digits than its factorization.

45540521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3503130.

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 45540521 is about 6748.3717295359. The cubic root of 45540521 is about 357.1077962001.

The spelling of 45540521 in words is "forty-five million, five hundred forty thousand, five hundred twenty-one".