45640521 has 6 divisors (see below), whose sum is σ = 65925210. Its totient is φ = 30427008.

The previous prime is 45640477. The next prime is 45640559. The reversal of 45640521 is 12504654.

45640521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 38937600 + 6702921 = 6240^2 + 2589^2 .

It is not a de Polignac number, because 45640521 - 2¹¹ = 45638473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (45640561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2535576 + ... + 2535593.

It is an arithmetic number, because the mean of its divisors is an integer number (10987535).

Almost surely, 2^45640521 is an apocalyptic number.

It is an amenable number.

45640521 is a deficient number, since it is larger than the sum of its proper divisors (20284689).

45640521 is a wasteful number, since it uses less digits than its factorization.

45640521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5071175 (or 5071172 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 45640521 is about 6755.7768613239. The cubic root of 45640521 is about 357.3689897643.

The spelling of 45640521 in words is "forty-five million, six hundred forty thousand, five hundred twenty-one".