71191117 has 2 divisors, whose sum is σ = 71191118. Its totient is φ = 71191116.

The previous prime is 71191103. The next prime is 71191147. The reversal of 71191117 is 71119117.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63457156 + 7733961 = 7966^2 + 2781^2 .

It is an emirp because it is prime and its reverse (71119117) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71191117 - 2⁷ = 71190989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71191147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35595558 + 35595559.

It is an arithmetic number, because the mean of its divisors is an integer number (35595559).

Almost surely, 2^71191117 is an apocalyptic number.

It is an amenable number.

71191117 is a deficient number, since it is larger than the sum of its proper divisors (1).

71191117 is an equidigital number, since it uses as much as digits as its factorization.

71191117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 441, while the sum is 28.

The square root of 71191117 is about 8437.4828592418. The cubic root of 71191117 is about 414.4529822894.

The spelling of 71191117 in words is "seventy-one million, one hundred ninety-one thousand, one hundred seventeen".