72220517 has 2 divisors, whose sum is σ = 72220518. Its totient is φ = 72220516.

The previous prime is 72220513. The next prime is 72220531. The reversal of 72220517 is 71502227.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49477156 + 22743361 = 7034^2 + 4769^2 .

It is an emirp because it is prime and its reverse (71502227) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72220517 - 2² = 72220513 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72220513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36110258 + 36110259.

It is an arithmetic number, because the mean of its divisors is an integer number (36110259).

Almost surely, 2^72220517 is an apocalyptic number.

It is an amenable number.

72220517 is a deficient number, since it is larger than the sum of its proper divisors (1).

72220517 is an equidigital number, since it uses as much as digits as its factorization.

72220517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1960, while the sum is 26.

The square root of 72220517 is about 8498.2655289182. The cubic root of 72220517 is about 416.4410482710.

The spelling of 72220517 in words is "seventy-two million, two hundred twenty thousand, five hundred seventeen".