45036721 has 2 divisors, whose sum is σ = 45036722. Its totient is φ = 45036720.

The previous prime is 45036703. The next prime is 45036731. The reversal of 45036721 is 12763054.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44076321 + 960400 = 6639^2 + 980^2 .

It is a cyclic number.

It is not a de Polignac number, because 45036721 - 2⁹ = 45036209 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 45036721.

It is not a weakly prime, because it can be changed into another prime (45036701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22518360 + 22518361.

It is an arithmetic number, because the mean of its divisors is an integer number (22518361).

Almost surely, 2^45036721 is an apocalyptic number.

It is an amenable number.

45036721 is a deficient number, since it is larger than the sum of its proper divisors (1).

45036721 is an equidigital number, since it uses as much as digits as its factorization.

45036721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 45036721 is about 6710.9403960995. The cubic root of 45036721 is about 355.7860542768.

Adding to 45036721 its reverse (12763054), we get a palindrome (57799775).

The spelling of 45036721 in words is "forty-five million, thirty-six thousand, seven hundred twenty-one".