45550721 has 2 divisors, whose sum is σ = 45550722. Its totient is φ = 45550720.

The previous prime is 45550699. The next prime is 45550723. The reversal of 45550721 is 12705554.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45495025 + 55696 = 6745^2 + 236^2 .

It is a cyclic number.

It is not a de Polignac number, because 45550721 - 2¹⁰ = 45549697 is a prime.

Together with 45550723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (45550723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22775360 + 22775361.

It is an arithmetic number, because the mean of its divisors is an integer number (22775361).

Almost surely, 2^45550721 is an apocalyptic number.

It is an amenable number.

45550721 is a deficient number, since it is larger than the sum of its proper divisors (1).

45550721 is an equidigital number, since it uses as much as digits as its factorization.

45550721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7000, while the sum is 29.

The square root of 45550721 is about 6749.1274250824. The cubic root of 45550721 is about 357.1344554443.

The spelling of 45550721 in words is "forty-five million, five hundred fifty thousand, seven hundred twenty-one".