45508321 has 4 divisors (see below), whose sum is σ = 45584644. Its totient is φ = 45432000.

The previous prime is 45508313. The next prime is 45508339. The reversal of 45508321 is 12380554.

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 14861025 + 30647296 = 3855^2 + 5536^2 .

It is a cyclic number.

It is not a de Polignac number, because 45508321 - 2³ = 45508313 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 45508321.

It is not an unprimeable number, because it can be changed into a prime (45508391) 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, 37260 + ... + 38461.

It is an arithmetic number, because the mean of its divisors is an integer number (11396161).

Almost surely, 2^45508321 is an apocalyptic number.

It is an amenable number.

45508321 is a deficient number, since it is larger than the sum of its proper divisors (76323).

45508321 is an equidigital number, since it uses as much as digits as its factorization.

45508321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76322.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 45508321 is about 6745.9855469753. The cubic root of 45508321 is about 357.0236104977.

Adding to 45508321 its reverse (12380554), we get a palindrome (57888875).

The spelling of 45508321 in words is "forty-five million, five hundred eight thousand, three hundred twenty-one".