45011521 has 4 divisors (see below), whose sum is σ = 45036544. Its totient is φ = 44986500.

The previous prime is 45011507. The next prime is 45011537. The reversal of 45011521 is 12511054.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12511054 = 2 ⋅6255527.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-45011521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (45011221) 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, 9585 + ... + 13486.

It is an arithmetic number, because the mean of its divisors is an integer number (11259136).

Almost surely, 2^45011521 is an apocalyptic number.

It is an amenable number.

45011521 is a deficient number, since it is larger than the sum of its proper divisors (25023).

45011521 is a wasteful number, since it uses less digits than its factorization.

45011521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25022.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 45011521 is about 6709.0626021822. The cubic root of 45011521 is about 355.7196826498.

Adding to 45011521 its reverse (12511054), we get a palindrome (57522575).

The spelling of 45011521 in words is "forty-five million, eleven thousand, five hundred twenty-one".