71122811 has 2 divisors, whose sum is σ = 71122812. Its totient is φ = 71122810.

The previous prime is 71122787. The next prime is 71122813. The reversal of 71122811 is 11822117.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71122811 is a prime.

Together with 71122813, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_4180154 and since 71122811 and 4180154 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (71122813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35561405 + 35561406.

It is an arithmetic number, because the mean of its divisors is an integer number (35561406).

Almost surely, 2^71122811 is an apocalyptic number.

71122811 is a deficient number, since it is larger than the sum of its proper divisors (1).

71122811 is an equidigital number, since it uses as much as digits as its factorization.

71122811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 224, while the sum is 23.

The square root of 71122811 is about 8433.4341166573. The cubic root of 71122811 is about 414.3203876364.

Adding to 71122811 its reverse (11822117), we get a palindrome (82944928).

The spelling of 71122811 in words is "seventy-one million, one hundred twenty-two thousand, eight hundred eleven".