72222457 has 2 divisors, whose sum is σ = 72222458. Its totient is φ = 72222456.

The previous prime is 72222433. The next prime is 72222463. The reversal of 72222457 is 75422227.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42889401 + 29333056 = 6549^2 + 5416^2 .

It is an emirp because it is prime and its reverse (75422227) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72222457 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72222497) 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, 36111228 + 36111229.

It is an arithmetic number, because the mean of its divisors is an integer number (36111229).

Almost surely, 2^72222457 is an apocalyptic number.

It is an amenable number.

72222457 is a deficient number, since it is larger than the sum of its proper divisors (1).

72222457 is an equidigital number, since it uses as much as digits as its factorization.

72222457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15680, while the sum is 31.

The square root of 72222457 is about 8498.3796690899. The cubic root of 72222457 is about 416.4447770748. Note that the first 3 decimals are identical.

The spelling of 72222457 in words is "seventy-two million, two hundred twenty-two thousand, four hundred fifty-seven".