3612438721 has 2 divisors, whose sum is σ = 3612438722. Its totient is φ = 3612438720.

The previous prime is 3612438703. The next prime is 3612438743. The reversal of 3612438721 is 1278342163.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2815788096 + 796650625 = 53064^2 + 28225^2 .

It is a cyclic number.

It is not a de Polignac number, because 3612438721 - 2¹¹ = 3612436673 is a prime.

It is not a weakly prime, because it can be changed into another prime (3612438521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1806219360 + 1806219361.

It is an arithmetic number, because the mean of its divisors is an integer number (1806219361).

Almost surely, 2^3612438721 is an apocalyptic number.

It is an amenable number.

3612438721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3612438721 is an equidigital number, since it uses as much as digits as its factorization.

3612438721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 37.

The square root of 3612438721 is about 60103.5666246189. The cubic root of 3612438721 is about 1534.3820040530.

The spelling of 3612438721 in words is "three billion, six hundred twelve million, four hundred thirty-eight thousand, seven hundred twenty-one".