72220019 has 2 divisors, whose sum is σ = 72220020. Its totient is φ = 72220018.

The previous prime is 72220013. The next prime is 72220033. The reversal of 72220019 is 91002227.

It is a weak prime.

It is an emirp because it is prime and its reverse (91002227) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72220019 is a prime.

It is a super-2 number, since 2×72220019² = 10431462288720722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 72219976 and 72220003.

It is not a weakly prime, because it can be changed into another prime (72220013) 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, 36110009 + 36110010.

It is an arithmetic number, because the mean of its divisors is an integer number (36110010).

Almost surely, 2^72220019 is an apocalyptic number.

72220019 is a deficient number, since it is larger than the sum of its proper divisors (1).

72220019 is an equidigital number, since it uses as much as digits as its factorization.

72220019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 72220019 is about 8498.2362287712. The cubic root of 72220019 is about 416.4400910725.

The spelling of 72220019 in words is "seventy-two million, two hundred twenty thousand, nineteen".