71931339 has 12 divisors (see below), whose sum is σ = 107484000. Its totient is φ = 46300464.

The previous prime is 71931337. The next prime is 71931341. The reversal of 71931339 is 93313917.

It is an interprime number because it is at equal distance from previous prime (71931337) and next prime (71931341).

It is not a de Polignac number, because 71931339 - 2¹ = 71931337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71931337) 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 11 ways as a sum of consecutive naturals, for example, 137539 + ... + 138060.

It is an arithmetic number, because the mean of its divisors is an integer number (8957000).

Almost surely, 2^71931339 is an apocalyptic number.

71931339 is a deficient number, since it is larger than the sum of its proper divisors (35552661).

71931339 is a wasteful number, since it uses less digits than its factorization.

71931339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275634 (or 275631 counting only the distinct ones).

The product of its digits is 15309, while the sum is 36.

The square root of 71931339 is about 8481.2345209881. The cubic root of 71931339 is about 415.8844812228.

The spelling of 71931339 in words is "seventy-one million, nine hundred thirty-one thousand, three hundred thirty-nine".