71638313 has 2 divisors, whose sum is σ = 71638314. Its totient is φ = 71638312.

The previous prime is 71638309. The next prime is 71638321. The reversal of 71638313 is 31383617.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47706649 + 23931664 = 6907^2 + 4892^2 .

It is an emirp because it is prime and its reverse (31383617) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71638313 - 2² = 71638309 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71638313.

It is not a weakly prime, because it can be changed into another prime (71638393) 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, 35819156 + 35819157.

It is an arithmetic number, because the mean of its divisors is an integer number (35819157).

Almost surely, 2^71638313 is an apocalyptic number.

It is an amenable number.

71638313 is a deficient number, since it is larger than the sum of its proper divisors (1).

71638313 is an equidigital number, since it uses as much as digits as its factorization.

71638313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 32.

The square root of 71638313 is about 8463.9419303301. The cubic root of 71638313 is about 415.3189844437.

The spelling of 71638313 in words is "seventy-one million, six hundred thirty-eight thousand, three hundred thirteen".