45565721 has 2 divisors, whose sum is σ = 45565722. Its totient is φ = 45565720.

The previous prime is 45565717. The next prime is 45565727. The reversal of 45565721 is 12756554.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31764496 + 13801225 = 5636^2 + 3715^2 .

It is a cyclic number.

It is not a de Polignac number, because 45565721 - 2² = 45565717 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (45565727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22782860 + 22782861.

It is an arithmetic number, because the mean of its divisors is an integer number (22782861).

Almost surely, 2^45565721 is an apocalyptic number.

It is an amenable number.

45565721 is a deficient number, since it is larger than the sum of its proper divisors (1).

45565721 is an equidigital number, since it uses as much as digits as its factorization.

45565721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42000, while the sum is 35.

The square root of 45565721 is about 6750.2385883760. The cubic root of 45565721 is about 357.1736529864.

The spelling of 45565721 in words is "forty-five million, five hundred sixty-five thousand, seven hundred twenty-one".