72221833 has 2 divisors, whose sum is σ = 72221834. Its totient is φ = 72221832.

The previous prime is 72221813. The next prime is 72221837. The reversal of 72221833 is 33812227.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69355584 + 2866249 = 8328^2 + 1693^2 .

It is a cyclic number.

It is not a de Polignac number, because 72221833 - 2⁵ = 72221801 is a prime.

It is not a weakly prime, because it can be changed into another prime (72221837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36110916 + 36110917.

It is an arithmetic number, because the mean of its divisors is an integer number (36110917).

Almost surely, 2^72221833 is an apocalyptic number.

It is an amenable number.

72221833 is a deficient number, since it is larger than the sum of its proper divisors (1).

72221833 is an equidigital number, since it uses as much as digits as its factorization.

72221833 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 28.

The square root of 72221833 is about 8498.3429561297. The cubic root of 72221833 is about 416.4435777143.

The spelling of 72221833 in words is "seventy-two million, two hundred twenty-one thousand, eight hundred thirty-three".