71143811 has 2 divisors, whose sum is σ = 71143812. Its totient is φ = 71143810.

The previous prime is 71143781. The next prime is 71143823. The reversal of 71143811 is 11834117.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71143811 - 2⁶ = 71143747 is a prime.

It is a super-2 number, since 2×71143811² = 10122883687207442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71143211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35571905 + 35571906.

It is an arithmetic number, because the mean of its divisors is an integer number (35571906).

Almost surely, 2^71143811 is an apocalyptic number.

71143811 is a deficient number, since it is larger than the sum of its proper divisors (1).

71143811 is an equidigital number, since it uses as much as digits as its factorization.

71143811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 672, while the sum is 26.

The square root of 71143811 is about 8434.6790691763. The cubic root of 71143811 is about 414.3611615776.

Adding to 71143811 its reverse (11834117), we get a palindrome (82977928).

The spelling of 71143811 in words is "seventy-one million, one hundred forty-three thousand, eight hundred eleven".