72242249 has 2 divisors, whose sum is σ = 72242250. Its totient is φ = 72242248.

The previous prime is 72242221. The next prime is 72242251. The reversal of 72242249 is 94224227.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48163600 + 24078649 = 6940^2 + 4907^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72242249 is a prime.

It is a Sophie Germain prime.

Together with 72242251, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (72242749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36121124 + 36121125.

It is an arithmetic number, because the mean of its divisors is an integer number (36121125).

Almost surely, 2^72242249 is an apocalyptic number.

It is an amenable number.

72242249 is a deficient number, since it is larger than the sum of its proper divisors (1).

72242249 is an equidigital number, since it uses as much as digits as its factorization.

72242249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 32.

The square root of 72242249 is about 8499.5440465945. The cubic root of 72242249 is about 416.4828147460.

The spelling of 72242249 in words is "seventy-two million, two hundred forty-two thousand, two hundred forty-nine".