71681239 has 8 divisors (see below), whose sum is σ = 82156320. Its totient is φ = 61264896.

The previous prime is 71681221. The next prime is 71681257. The reversal of 71681239 is 93218617.

It is an interprime number because it is at equal distance from previous prime (71681221) and next prime (71681257).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 71681239 - 2⁷ = 71681111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71681198 and 71681207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71681219) 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 in 7 ways as a sum of consecutive naturals, for example, 12034 + ... + 16975.

It is an arithmetic number, because the mean of its divisors is an integer number (10269540).

Almost surely, 2^71681239 is an apocalyptic number.

71681239 is a deficient number, since it is larger than the sum of its proper divisors (10475081).

71681239 is a wasteful number, since it uses less digits than its factorization.

71681239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29369.

The product of its digits is 18144, while the sum is 37.

The square root of 71681239 is about 8466.4773666502. The cubic root of 71681239 is about 415.4019215495.

The spelling of 71681239 in words is "seventy-one million, six hundred eighty-one thousand, two hundred thirty-nine".