71071391 has 2 divisors, whose sum is σ = 71071392. Its totient is φ = 71071390.

The previous prime is 71071387. The next prime is 71071397. The reversal of 71071391 is 19317017.

It is a weak prime.

It is an emirp because it is prime and its reverse (19317017) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71071391 - 2² = 71071387 is a prime.

It is a super-2 number, since 2×71071391² = 10102285237349762, which contains 22 as substring.

It is a Chen prime.

It is equal to p_4177316 and since 71071391 and 4177316 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71071397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35535695 + 35535696.

It is an arithmetic number, because the mean of its divisors is an integer number (35535696).

Almost surely, 2^71071391 is an apocalyptic number.

71071391 is a deficient number, since it is larger than the sum of its proper divisors (1).

71071391 is an equidigital number, since it uses as much as digits as its factorization.

71071391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1323, while the sum is 29.

The square root of 71071391 is about 8430.3849852780. The cubic root of 71071391 is about 414.2205158313.

The spelling of 71071391 in words is "seventy-one million, seventy-one thousand, three hundred ninety-one".