71331986 has 8 divisors (see below), whose sum is σ = 116725104. Its totient is φ = 32423620.

The previous prime is 71331979. The next prime is 71331991. The reversal of 71331986 is 68913317.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1621160 + ... + 1621203.

It is an arithmetic number, because the mean of its divisors is an integer number (14590638).

Almost surely, 2^71331986 is an apocalyptic number.

71331986 is a deficient number, since it is larger than the sum of its proper divisors (45393118).

71331986 is a wasteful number, since it uses less digits than its factorization.

71331986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3242376.

The product of its digits is 27216, while the sum is 38.

The square root of 71331986 is about 8445.8265433290. The cubic root of 71331986 is about 414.7261676397.

It can be divided in two parts, 7133 and 1986, that added together give a palindrome (9119).

The spelling of 71331986 in words is "seventy-one million, three hundred thirty-one thousand, nine hundred eighty-six".