71143823 has 2 divisors, whose sum is σ = 71143824. Its totient is φ = 71143822.

The previous prime is 71143811. The next prime is 71143889. The reversal of 71143823 is 32834117.

It is a weak prime.

It is an emirp because it is prime and its reverse (32834117) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71143823 is a prime.

It is a super-2 number, since 2×71143823² = 10122887102110658, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71143223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35571911 + 35571912.

It is an arithmetic number, because the mean of its divisors is an integer number (35571912).

Almost surely, 2^71143823 is an apocalyptic number.

71143823 is a deficient number, since it is larger than the sum of its proper divisors (1).

71143823 is an equidigital number, since it uses as much as digits as its factorization.

71143823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 29.

The square root of 71143823 is about 8434.6797805252. The cubic root of 71143823 is about 414.3611848747.

The spelling of 71143823 in words is "seventy-one million, one hundred forty-three thousand, eight hundred twenty-three".