72142249 has 2 divisors, whose sum is σ = 72142250. Its totient is φ = 72142248.

The previous prime is 72142241. The next prime is 72142307. The reversal of 72142249 is 94224127.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59182249 + 12960000 = 7693^2 + 3600^2 .

It is an emirp because it is prime and its reverse (94224127) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72142249 - 2³ = 72142241 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72142249.

It is not a weakly prime, because it can be changed into another prime (72142241) 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, 36071124 + 36071125.

It is an arithmetic number, because the mean of its divisors is an integer number (36071125).

Almost surely, 2^72142249 is an apocalyptic number.

It is an amenable number.

72142249 is a deficient number, since it is larger than the sum of its proper divisors (1).

72142249 is an equidigital number, since it uses as much as digits as its factorization.

72142249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 31.

The square root of 72142249 is about 8493.6593409437. The cubic root of 72142249 is about 416.2905564586.

The spelling of 72142249 in words is "seventy-two million, one hundred forty-two thousand, two hundred forty-nine".