45127721 has 2 divisors, whose sum is σ = 45127722. Its totient is φ = 45127720.

The previous prime is 45127711. The next prime is 45127727. The reversal of 45127721 is 12772154.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41422096 + 3705625 = 6436^2 + 1925^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-45127721 is a prime.

It is a super-2 number, since 2×45127721² = 4073022405307682, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (45127727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22563860 + 22563861.

It is an arithmetic number, because the mean of its divisors is an integer number (22563861).

Almost surely, 2^45127721 is an apocalyptic number.

It is an amenable number.

45127721 is a deficient number, since it is larger than the sum of its proper divisors (1).

45127721 is an equidigital number, since it uses as much as digits as its factorization.

45127721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3920, while the sum is 29.

The square root of 45127721 is about 6717.7169484878. The cubic root of 45127721 is about 356.0255236718.

Adding to 45127721 its reverse (12772154), we get a palindrome (57899875).

The spelling of 45127721 in words is "forty-five million, one hundred twenty-seven thousand, seven hundred twenty-one".