45225721 has 2 divisors, whose sum is σ = 45225722. Its totient is φ = 45225720.

The previous prime is 45225707. The next prime is 45225769. The reversal of 45225721 is 12752254.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43296400 + 1929321 = 6580^2 + 1389^2 .

It is a cyclic number.

It is not a de Polignac number, because 45225721 - 2⁵ = 45225689 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 45225721.

It is not a weakly prime, because it can be changed into another prime (45225701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22612860 + 22612861.

It is an arithmetic number, because the mean of its divisors is an integer number (22612861).

Almost surely, 2^45225721 is an apocalyptic number.

It is an amenable number.

45225721 is a deficient number, since it is larger than the sum of its proper divisors (1).

45225721 is an equidigital number, since it uses as much as digits as its factorization.

45225721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5600, while the sum is 28.

The square root of 45225721 is about 6725.0071375427. The cubic root of 45225721 is about 356.2830540378.

Adding to 45225721 its reverse (12752254), we get a palindrome (57977975).

The spelling of 45225721 in words is "forty-five million, two hundred twenty-five thousand, seven hundred twenty-one".