72368561 has 2 divisors, whose sum is σ = 72368562. Its totient is φ = 72368560.

The previous prime is 72368551. The next prime is 72368581. The reversal of 72368561 is 16586327.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71656225 + 712336 = 8465^2 + 844^2 .

It is a cyclic number.

It is not a de Polignac number, because 72368561 - 2⁶ = 72368497 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p_4249199 and since 72368561 and 4249199 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (72368501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36184280 + 36184281.

It is an arithmetic number, because the mean of its divisors is an integer number (36184281).

Almost surely, 2^72368561 is an apocalyptic number.

It is an amenable number.

72368561 is a deficient number, since it is larger than the sum of its proper divisors (1).

72368561 is an equidigital number, since it uses as much as digits as its factorization.

72368561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 38.

The square root of 72368561 is about 8506.9713176900. The cubic root of 72368561 is about 416.7254066165.

The spelling of 72368561 in words is "seventy-two million, three hundred sixty-eight thousand, five hundred sixty-one".