72212279 has 2 divisors, whose sum is σ = 72212280. Its totient is φ = 72212278.

The previous prime is 72212213. The next prime is 72212297. The reversal of 72212279 is 97221227.

Together with next prime (72212297) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (97221227) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72212279 is a prime.

It is a super-2 number, since 2×72212279² = 10429226476747682, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72215279) 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, 36106139 + 36106140.

It is an arithmetic number, because the mean of its divisors is an integer number (36106140).

Almost surely, 2^72212279 is an apocalyptic number.

72212279 is a deficient number, since it is larger than the sum of its proper divisors (1).

72212279 is an equidigital number, since it uses as much as digits as its factorization.

72212279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7056, while the sum is 32.

The square root of 72212279 is about 8497.7808279574. The cubic root of 72212279 is about 416.4252135658.

The spelling of 72212279 in words is "seventy-two million, two hundred twelve thousand, two hundred seventy-nine".