71331391 has 8 divisors (see below), whose sum is σ = 72411200. Its totient is φ = 70256160.

The previous prime is 71331373. The next prime is 71331397. The reversal of 71331391 is 19313317.

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

It is a cyclic number.

It is not a de Polignac number, because 71331391 - 2⁹ = 71330879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71331397) 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, 41905 + ... + 43573.

It is an arithmetic number, because the mean of its divisors is an integer number (9051400).

Almost surely, 2^71331391 is an apocalyptic number.

71331391 is a deficient number, since it is larger than the sum of its proper divisors (1079809).

71331391 is a wasteful number, since it uses less digits than its factorization.

71331391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2289.

The product of its digits is 1701, while the sum is 28.

The square root of 71331391 is about 8445.7913187575. The cubic root of 71331391 is about 414.7250145209.

The spelling of 71331391 in words is "seventy-one million, three hundred thirty-one thousand, three hundred ninety-one".