45320521 has 4 divisors (see below), whose sum is σ = 47986452. Its totient is φ = 42654592.

The previous prime is 45320489. The next prime is 45320531. The reversal of 45320521 is 12502354.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12502354 = 2 ⋅6251177.

It can be written as a sum of positive squares in 2 ways, for example, as 20430400 + 24890121 = 4520^2 + 4989^2 .

It is a cyclic number.

It is not a de Polignac number, because 45320521 - 2⁵ = 45320489 is a prime.

It is a super-2 number, since 2×45320521² = 4107899247422882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 45320492 and 45320501.

It is not an unprimeable number, because it can be changed into a prime (45320531) 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, 1332940 + ... + 1332973.

It is an arithmetic number, because the mean of its divisors is an integer number (11996613).

Almost surely, 2^45320521 is an apocalyptic number.

It is an amenable number.

45320521 is a deficient number, since it is larger than the sum of its proper divisors (2665931).

45320521 is a wasteful number, since it uses less digits than its factorization.

45320521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2665930.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 45320521 is about 6732.0517674777. The cubic root of 45320521 is about 356.5318214840.

Adding to 45320521 its reverse (12502354), we get a palindrome (57822875).

The spelling of 45320521 in words is "forty-five million, three hundred twenty thousand, five hundred twenty-one".