71131391 has 8 divisors (see below), whose sum is σ = 73738368. Its totient is φ = 68544000.

The previous prime is 71131369. The next prime is 71131397. The reversal of 71131391 is 19313117.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71131391 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71131391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71131397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2711 + ... + 12231.

It is an arithmetic number, because the mean of its divisors is an integer number (9217296).

Almost surely, 2^71131391 is an apocalyptic number.

71131391 is a deficient number, since it is larger than the sum of its proper divisors (2606977).

71131391 is a wasteful number, since it uses less digits than its factorization.

71131391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9793.

The product of its digits is 567, while the sum is 26.

The square root of 71131391 is about 8433.9427908897. The cubic root of 71131391 is about 414.3370476734.

The spelling of 71131391 in words is "seventy-one million, one hundred thirty-one thousand, three hundred ninety-one".