71618321 has 2 divisors, whose sum is σ = 71618322. Its totient is φ = 71618320.

The previous prime is 71618311. The next prime is 71618333. The reversal of 71618321 is 12381617.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65044225 + 6574096 = 8065^2 + 2564^2 .

It is a cyclic number.

It is not a de Polignac number, because 71618321 - 2²⁶ = 4509457 is a prime.

It is not a weakly prime, because it can be changed into another prime (71618311) 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, 35809160 + 35809161.

It is an arithmetic number, because the mean of its divisors is an integer number (35809161).

Almost surely, 2^71618321 is an apocalyptic number.

It is an amenable number.

71618321 is a deficient number, since it is larger than the sum of its proper divisors (1).

71618321 is an equidigital number, since it uses as much as digits as its factorization.

71618321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 29.

The square root of 71618321 is about 8462.7608379299. The cubic root of 71618321 is about 415.2803466940.

Adding to 71618321 its reverse (12381617), we get a palindrome (83999938).

The spelling of 71618321 in words is "seventy-one million, six hundred eighteen thousand, three hundred twenty-one".