71086109 has 2 divisors, whose sum is σ = 71086110. Its totient is φ = 71086108.

The previous prime is 71086079. The next prime is 71086117. The reversal of 71086109 is 90168017.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70930084 + 156025 = 8422^2 + 395^2 .

It is a cyclic number.

It is not a de Polignac number, because 71086109 - 2¹² = 71082013 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71088109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35543054 + 35543055.

It is an arithmetic number, because the mean of its divisors is an integer number (35543055).

Almost surely, 2^71086109 is an apocalyptic number.

It is an amenable number.

71086109 is a deficient number, since it is larger than the sum of its proper divisors (1).

71086109 is an equidigital number, since it uses as much as digits as its factorization.

71086109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 71086109 is about 8431.2578539622. The cubic root of 71086109 is about 414.2491071612.

The spelling of 71086109 in words is "seventy-one million, eighty-six thousand, one hundred nine".