45107721 has 6 divisors (see below), whose sum is σ = 65155610. Its totient is φ = 30071808.

The previous prime is 45107719. The next prime is 45107723. The reversal of 45107721 is 12770154.

It is an interprime number because it is at equal distance from previous prime (45107719) and next prime (45107723).

It can be written as a sum of positive squares in only one way, i.e., 44036496 + 1071225 = 6636^2 + 1035^2 .

It is not a de Polignac number, because 45107721 - 2¹ = 45107719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (45107723) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2505976 + ... + 2505993.

Almost surely, 2^45107721 is an apocalyptic number.

It is an amenable number.

45107721 is a deficient number, since it is larger than the sum of its proper divisors (20047889).

45107721 is a wasteful number, since it uses less digits than its factorization.

45107721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5011975 (or 5011972 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 27.

The square root of 45107721 is about 6716.2281825441. The cubic root of 45107721 is about 355.9729206562.

Adding to 45107721 its reverse (12770154), we get a palindrome (57877875).

The spelling of 45107721 in words is "forty-five million, one hundred seven thousand, seven hundred twenty-one".