72144251 has 2 divisors, whose sum is σ = 72144252. Its totient is φ = 72144250.

The previous prime is 72144217. The next prime is 72144263. The reversal of 72144251 is 15244127.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72144251 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72144251.

It is not a weakly prime, because it can be changed into another prime (72140251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36072125 + 36072126.

It is an arithmetic number, because the mean of its divisors is an integer number (36072126).

Almost surely, 2^72144251 is an apocalyptic number.

72144251 is a deficient number, since it is larger than the sum of its proper divisors (1).

72144251 is an equidigital number, since it uses as much as digits as its factorization.

72144251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2240, while the sum is 26.

The square root of 72144251 is about 8493.7771927453. Note that the first 3 decimals coincide. The cubic root of 72144251 is about 416.2944072118.

Adding to 72144251 its reverse (15244127), we get a palindrome (87388378).

The spelling of 72144251 in words is "seventy-two million, one hundred forty-four thousand, two hundred fifty-one".