71311331 has 8 divisors (see below), whose sum is σ = 87767904. Its totient is φ = 56422080.

The previous prime is 71311307. The next prime is 71311333. The reversal of 71311331 is 13311317.

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

It is not a de Polignac number, because 71311331 - 2²⁶ = 4202467 is a prime.

It is a super-2 number, since 2×71311331² = 10170611857983122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (71311333) 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, 391730 + ... + 391911.

It is an arithmetic number, because the mean of its divisors is an integer number (10970988).

Almost surely, 2^71311331 is an apocalyptic number.

71311331 is a deficient number, since it is larger than the sum of its proper divisors (16456573).

71311331 is a wasteful number, since it uses less digits than its factorization.

71311331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 783661.

The product of its digits is 189, while the sum is 20.

The square root of 71311331 is about 8444.6036615107. The cubic root of 71311331 is about 414.6861341923.

Adding to 71311331 its reverse (13311317), we get a palindrome (84622648).

The spelling of 71311331 in words is "seventy-one million, three hundred eleven thousand, three hundred thirty-one".