71164391 has 2 divisors, whose sum is σ = 71164392. Its totient is φ = 71164390.

The previous prime is 71164351. The next prime is 71164393. The reversal of 71164391 is 19346117.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71164391 - 2²² = 66970087 is a prime.

It is a Sophie Germain prime.

Together with 71164393, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71164393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35582195 + 35582196.

It is an arithmetic number, because the mean of its divisors is an integer number (35582196).

Almost surely, 2^71164391 is an apocalyptic number.

71164391 is a deficient number, since it is larger than the sum of its proper divisors (1).

71164391 is an equidigital number, since it uses as much as digits as its factorization.

71164391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 32.

The square root of 71164391 is about 8435.8989443924. The cubic root of 71164391 is about 414.4011122562.

The spelling of 71164391 in words is "seventy-one million, one hundred sixty-four thousand, three hundred ninety-one".