71047231 has 2 divisors, whose sum is σ = 71047232. Its totient is φ = 71047230.

The previous prime is 71047183. The next prime is 71047247. The reversal of 71047231 is 13274017.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71047231 - 2¹⁹ = 70522943 is a prime.

It is a super-2 number, since 2×71047231² = 10095418065534722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 71047196 and 71047205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71047271) 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 as a sum of consecutive naturals, namely, 35523615 + 35523616.

It is an arithmetic number, because the mean of its divisors is an integer number (35523616).

Almost surely, 2^71047231 is an apocalyptic number.

71047231 is a deficient number, since it is larger than the sum of its proper divisors (1).

71047231 is an equidigital number, since it uses as much as digits as its factorization.

71047231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1176, while the sum is 25.

The square root of 71047231 is about 8428.9519514587. The cubic root of 71047231 is about 414.1735738212.

The spelling of 71047231 in words is "seventy-one million, forty-seven thousand, two hundred thirty-one".