71688317 has 2 divisors, whose sum is σ = 71688318. Its totient is φ = 71688316.

The previous prime is 71688283. The next prime is 71688341. The reversal of 71688317 is 71388617.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63457156 + 8231161 = 7966^2 + 2869^2 .

It is a cyclic number.

It is not a de Polignac number, because 71688317 - 2¹⁰ = 71687293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71688347) 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, 35844158 + 35844159.

It is an arithmetic number, because the mean of its divisors is an integer number (35844159).

Almost surely, 2^71688317 is an apocalyptic number.

It is an amenable number.

71688317 is a deficient number, since it is larger than the sum of its proper divisors (1).

71688317 is an equidigital number, since it uses as much as digits as its factorization.

71688317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56448, while the sum is 41.

The square root of 71688317 is about 8466.8953578038. The cubic root of 71688317 is about 415.4155937371.

The spelling of 71688317 in words is "seventy-one million, six hundred eighty-eight thousand, three hundred seventeen".