71328031 has 2 divisors, whose sum is σ = 71328032. Its totient is φ = 71328030.

The previous prime is 71328029. The next prime is 71328041. The reversal of 71328031 is 13082317.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71328031 - 2¹ = 71328029 is a prime.

It is a super-2 number, since 2×71328031² = 10175376012673922, which contains 22 as substring.

Together with 71328029, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 71327987 and 71328005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71328011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35664015 + 35664016.

It is an arithmetic number, because the mean of its divisors is an integer number (35664016).

Almost surely, 2^71328031 is an apocalyptic number.

71328031 is a deficient number, since it is larger than the sum of its proper divisors (1).

71328031 is an equidigital number, since it uses as much as digits as its factorization.

71328031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 71328031 is about 8445.5924007733. The cubic root of 71328031 is about 414.7185026711.

The spelling of 71328031 in words is "seventy-one million, three hundred twenty-eight thousand, thirty-one".