72316481 has 2 divisors, whose sum is σ = 72316482. Its totient is φ = 72316480.

The previous prime is 72316471. The next prime is 72316483. The reversal of 72316481 is 18461327.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69222400 + 3094081 = 8320^2 + 1759^2 .

It is an emirp because it is prime and its reverse (18461327) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72316481 is a prime.

It is a super-2 number, since 2×72316481² = 10459346848446722, which contains 22 as substring.

Together with 72316483, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72316483) 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, 36158240 + 36158241.

It is an arithmetic number, because the mean of its divisors is an integer number (36158241).

Almost surely, 2^72316481 is an apocalyptic number.

It is an amenable number.

72316481 is a deficient number, since it is larger than the sum of its proper divisors (1).

72316481 is an equidigital number, since it uses as much as digits as its factorization.

72316481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 32.

The square root of 72316481 is about 8503.9097478748. The cubic root of 72316481 is about 416.6254172143.

The spelling of 72316481 in words is "seventy-two million, three hundred sixteen thousand, four hundred eighty-one".