71604191 has 2 divisors, whose sum is σ = 71604192. Its totient is φ = 71604190.

The previous prime is 71604151. The next prime is 71604193. The reversal of 71604191 is 19140617.

It is a strong prime.

It is an emirp because it is prime and its reverse (19140617) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71604191 is a prime.

Together with 71604193, 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 (71604193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35802095 + 35802096.

It is an arithmetic number, because the mean of its divisors is an integer number (35802096).

Almost surely, 2^71604191 is an apocalyptic number.

71604191 is a deficient number, since it is larger than the sum of its proper divisors (1).

71604191 is an equidigital number, since it uses as much as digits as its factorization.

71604191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 71604191 is about 8461.9259628054. The cubic root of 71604191 is about 415.2530338632.

The spelling of 71604191 in words is "seventy-one million, six hundred four thousand, one hundred ninety-one".