72337561 has 2 divisors, whose sum is σ = 72337562. Its totient is φ = 72337560.

The previous prime is 72337543. The next prime is 72337583. The reversal of 72337561 is 16573327.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58049161 + 14288400 = 7619^2 + 3780^2 .

It is an emirp because it is prime and its reverse (16573327) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72337561 - 2²¹ = 70240409 is a prime.

It is not a weakly prime, because it can be changed into another prime (72337961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36168780 + 36168781.

It is an arithmetic number, because the mean of its divisors is an integer number (36168781).

Almost surely, 2^72337561 is an apocalyptic number.

It is an amenable number.

72337561 is a deficient number, since it is larger than the sum of its proper divisors (1).

72337561 is an equidigital number, since it uses as much as digits as its factorization.

72337561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26460, while the sum is 34.

The square root of 72337561 is about 8505.1490874646. The cubic root of 72337561 is about 416.6658948963.

The spelling of 72337561 in words is "seventy-two million, three hundred thirty-seven thousand, five hundred sixty-one".