71318399 has 2 divisors, whose sum is σ = 71318400. Its totient is φ = 71318398.

The previous prime is 71318369. The next prime is 71318437. The reversal of 71318399 is 99381317.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71318399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71318309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35659199 + 35659200.

It is an arithmetic number, because the mean of its divisors is an integer number (35659200).

Almost surely, 2^71318399 is an apocalyptic number.

71318399 is a deficient number, since it is larger than the sum of its proper divisors (1).

71318399 is an equidigital number, since it uses as much as digits as its factorization.

71318399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 41.

The square root of 71318399 is about 8445.0221432510. The cubic root of 71318399 is about 414.6998342346.

It can be divided in two parts, 71318 and 399, that added together give a palindrome (71717).

The spelling of 71318399 in words is "seventy-one million, three hundred eighteen thousand, three hundred ninety-nine".