72517279 has 2 divisors, whose sum is σ = 72517280. Its totient is φ = 72517278.

The previous prime is 72517267. The next prime is 72517283. The reversal of 72517279 is 97271527.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (97271527) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72517279 - 2⁹ = 72516767 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72517219) 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, 36258639 + 36258640.

It is an arithmetic number, because the mean of its divisors is an integer number (36258640).

Almost surely, 2^72517279 is an apocalyptic number.

72517279 is a deficient number, since it is larger than the sum of its proper divisors (1).

72517279 is an equidigital number, since it uses as much as digits as its factorization.

72517279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 61740, while the sum is 40.

The square root of 72517279 is about 8515.7077803316. The cubic root of 72517279 is about 417.0106693688.

The spelling of 72517279 in words is "seventy-two million, five hundred seventeen thousand, two hundred seventy-nine".