45729721 has 2 divisors, whose sum is σ = 45729722. Its totient is φ = 45729720.

The previous prime is 45729709. The next prime is 45729737. The reversal of 45729721 is 12792754.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27709696 + 18020025 = 5264^2 + 4245^2 .

It is a cyclic number.

It is not a de Polignac number, because 45729721 - 2⁹ = 45729209 is a prime.

It is not a weakly prime, because it can be changed into another prime (45729701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22864860 + 22864861.

It is an arithmetic number, because the mean of its divisors is an integer number (22864861).

Almost surely, 2^45729721 is an apocalyptic number.

It is an amenable number.

45729721 is a deficient number, since it is larger than the sum of its proper divisors (1).

45729721 is an equidigital number, since it uses as much as digits as its factorization.

45729721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35280, while the sum is 37.

The square root of 45729721 is about 6762.3753962642. The cubic root of 45729721 is about 357.6016526748.

The spelling of 45729721 in words is "forty-five million, seven hundred twenty-nine thousand, seven hundred twenty-one".