71685959 has 2 divisors, whose sum is σ = 71685960. Its totient is φ = 71685958.

The previous prime is 71685947. The next prime is 71685973. The reversal of 71685959 is 95958617.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71685959 - 2²⁴ = 54908743 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71685979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35842979 + 35842980.

It is an arithmetic number, because the mean of its divisors is an integer number (35842980).

Almost surely, 2^71685959 is an apocalyptic number.

71685959 is a deficient number, since it is larger than the sum of its proper divisors (1).

71685959 is an equidigital number, since it uses as much as digits as its factorization.

71685959 is an evil number, because the sum of its binary digits is even.

The product of its digits is 680400, while the sum is 50.

The square root of 71685959 is about 8466.7561084515. The cubic root of 71685959 is about 415.4110390167.

The spelling of 71685959 in words is "seventy-one million, six hundred eighty-five thousand, nine hundred fifty-nine".