72246931 has 2 divisors, whose sum is σ = 72246932. Its totient is φ = 72246930.

The previous prime is 72246929. The next prime is 72246947. The reversal of 72246931 is 13964227.

It is a weak prime.

It is an emirp because it is prime and its reverse (13964227) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72246931 - 2¹ = 72246929 is a prime.

It is a super-2 number, since 2×72246931² = 10439238077837522, which contains 22 as substring.

Together with 72246929, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (72246901) 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, 36123465 + 36123466.

It is an arithmetic number, because the mean of its divisors is an integer number (36123466).

Almost surely, 2^72246931 is an apocalyptic number.

72246931 is a deficient number, since it is larger than the sum of its proper divisors (1).

72246931 is an equidigital number, since it uses as much as digits as its factorization.

72246931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 34.

The square root of 72246931 is about 8499.8194686711. The cubic root of 72246931 is about 416.4918119300.

It can be divided in two parts, 722469 and 31, that added together give a square (722500 = 850²).

The spelling of 72246931 in words is "seventy-two million, two hundred forty-six thousand, nine hundred thirty-one".