71439811 has 2 divisors, whose sum is σ = 71439812. Its totient is φ = 71439810.

The previous prime is 71439793. The next prime is 71439827. The reversal of 71439811 is 11893417.

It is a strong prime.

It is an emirp because it is prime and its reverse (11893417) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71439811 - 2¹¹ = 71437763 is a prime.

It is not a weakly prime, because it can be changed into another prime (71439881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35719905 + 35719906.

It is an arithmetic number, because the mean of its divisors is an integer number (35719906).

Almost surely, 2^71439811 is an apocalyptic number.

71439811 is a deficient number, since it is larger than the sum of its proper divisors (1).

71439811 is an equidigital number, since it uses as much as digits as its factorization.

71439811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 34.

The square root of 71439811 is about 8452.2074631424. The cubic root of 71439811 is about 414.9350282958.

The spelling of 71439811 in words is "seventy-one million, four hundred thirty-nine thousand, eight hundred eleven".