44665721 has 2 divisors, whose sum is σ = 44665722. Its totient is φ = 44665720.

The previous prime is 44665717. The next prime is 44665723. The reversal of 44665721 is 12756644.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43705321 + 960400 = 6611^2 + 980^2 .

It is a cyclic number.

It is not a de Polignac number, because 44665721 - 2² = 44665717 is a prime.

Together with 44665723, 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 (44665723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22332860 + 22332861.

It is an arithmetic number, because the mean of its divisors is an integer number (22332861).

Almost surely, 2^44665721 is an apocalyptic number.

It is an amenable number.

44665721 is a deficient number, since it is larger than the sum of its proper divisors (1).

44665721 is an equidigital number, since it uses as much as digits as its factorization.

44665721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 35.

The square root of 44665721 is about 6683.2418031970. The cubic root of 44665721 is about 354.8064037336.

The spelling of 44665721 in words is "forty-four million, six hundred sixty-five thousand, seven hundred twenty-one".