72222497 has 2 divisors, whose sum is σ = 72222498. Its totient is φ = 72222496.

The previous prime is 72222463. The next prime is 72222509. The reversal of 72222497 is 79422227.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58354321 + 13868176 = 7639^2 + 3724^2 .

It is an emirp because it is prime and its reverse (79422227) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72222497 - 2⁶ = 72222433 is a prime.

It is not a weakly prime, because it can be changed into another prime (72222457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36111248 + 36111249.

It is an arithmetic number, because the mean of its divisors is an integer number (36111249).

Almost surely, 2^72222497 is an apocalyptic number.

It is an amenable number.

72222497 is a deficient number, since it is larger than the sum of its proper divisors (1).

72222497 is an equidigital number, since it uses as much as digits as its factorization.

72222497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28224, while the sum is 35.

The square root of 72222497 is about 8498.3820224793. The cubic root of 72222497 is about 416.4448539566. Note that the first 3 decimals are identical.

The spelling of 72222497 in words is "seventy-two million, two hundred twenty-two thousand, four hundred ninety-seven".