72144361 has 2 divisors, whose sum is σ = 72144362. Its totient is φ = 72144360.

The previous prime is 72144343. The next prime is 72144383. The reversal of 72144361 is 16344127.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64304361 + 7840000 = 8019^2 + 2800^2 .

It is an emirp because it is prime and its reverse (16344127) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72144361 - 2¹¹ = 72142313 is a prime.

It is not a weakly prime, because it can be changed into another prime (72144661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36072180 + 36072181.

It is an arithmetic number, because the mean of its divisors is an integer number (36072181).

Almost surely, 2^72144361 is an apocalyptic number.

It is an amenable number.

72144361 is a deficient number, since it is larger than the sum of its proper divisors (1).

72144361 is an equidigital number, since it uses as much as digits as its factorization.

72144361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 28.

The square root of 72144361 is about 8493.7836680716. The cubic root of 72144361 is about 416.2946187896.

Adding to 72144361 its reverse (16344127), we get a palindrome (88488488).

The spelling of 72144361 in words is "seventy-two million, one hundred forty-four thousand, three hundred sixty-one".