45144721 has 4 divisors (see below), whose sum is σ = 45158512. Its totient is φ = 45130932.

The previous prime is 45144719. The next prime is 45144727. The reversal of 45144721 is 12744154.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 45144721 - 2¹ = 45144719 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 45144721.

It is not an unprimeable number, because it can be changed into a prime (45144727) 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, 1126 + ... + 9568.

It is an arithmetic number, because the mean of its divisors is an integer number (11289628).

Almost surely, 2^45144721 is an apocalyptic number.

It is an amenable number.

45144721 is a deficient number, since it is larger than the sum of its proper divisors (13791).

45144721 is an equidigital number, since it uses as much as digits as its factorization.

45144721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13790.

The product of its digits is 4480, while the sum is 28.

The square root of 45144721 is about 6718.9821401757. The cubic root of 45144721 is about 356.0702240166.

Adding to 45144721 its reverse (12744154), we get a palindrome (57888875).

The spelling of 45144721 in words is "forty-five million, one hundred forty-four thousand, seven hundred twenty-one".