71939071 has 2 divisors, whose sum is σ = 71939072. Its totient is φ = 71939070.

The previous prime is 71939057. The next prime is 71939083. The reversal of 71939071 is 17093917.

It is a strong prime.

It is an emirp because it is prime and its reverse (17093917) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71939071 - 2⁷ = 71938943 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71939071.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71939471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35969535 + 35969536.

It is an arithmetic number, because the mean of its divisors is an integer number (35969536).

Almost surely, 2^71939071 is an apocalyptic number.

71939071 is a deficient number, since it is larger than the sum of its proper divisors (1).

71939071 is an equidigital number, since it uses as much as digits as its factorization.

71939071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11907, while the sum is 37.

The square root of 71939071 is about 8481.6903386059. The cubic root of 71939071 is about 415.8993820233.

The spelling of 71939071 in words is "seventy-one million, nine hundred thirty-nine thousand, seventy-one".