71552321 has 2 divisors, whose sum is σ = 71552322. Its totient is φ = 71552320.

The previous prime is 71552317. The next prime is 71552353. The reversal of 71552321 is 12325517.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39187600 + 32364721 = 6260^2 + 5689^2 .

It is an emirp because it is prime and its reverse (12325517) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71552321 - 2² = 71552317 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71552311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35776160 + 35776161.

It is an arithmetic number, because the mean of its divisors is an integer number (35776161).

Almost surely, 2^71552321 is an apocalyptic number.

It is an amenable number.

71552321 is a deficient number, since it is larger than the sum of its proper divisors (1).

71552321 is an equidigital number, since it uses as much as digits as its factorization.

71552321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2100, while the sum is 26.

The square root of 71552321 is about 8458.8605024554. The cubic root of 71552321 is about 415.1527400226.

Adding to 71552321 its reverse (12325517), we get a palindrome (83877838).

The spelling of 71552321 in words is "seventy-one million, five hundred fifty-two thousand, three hundred twenty-one".