72243137 has 2 divisors, whose sum is σ = 72243138. Its totient is φ = 72243136.

The previous prime is 72243131. The next prime is 72243151. The reversal of 72243137 is 73134227.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59845696 + 12397441 = 7736^2 + 3521^2 .

It is a cyclic number.

It is not a de Polignac number, because 72243137 - 2¹⁰ = 72242113 is a prime.

It is not a weakly prime, because it can be changed into another prime (72243131) 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, 36121568 + 36121569.

It is an arithmetic number, because the mean of its divisors is an integer number (36121569).

Almost surely, 2^72243137 is an apocalyptic number.

It is an amenable number.

72243137 is a deficient number, since it is larger than the sum of its proper divisors (1).

72243137 is an equidigital number, since it uses as much as digits as its factorization.

72243137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7056, while the sum is 29.

The square root of 72243137 is about 8499.5962845302. The cubic root of 72243137 is about 416.4845212047.

The spelling of 72243137 in words is "seventy-two million, two hundred forty-three thousand, one hundred thirty-seven".