71907109 has 2 divisors, whose sum is σ = 71907110. Its totient is φ = 71907108.

The previous prime is 71907097. The next prime is 71907119. The reversal of 71907109 is 90170917.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71876484 + 30625 = 8478^2 + 175^2 .

It is an emirp because it is prime and its reverse (90170917) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71907109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71907119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35953554 + 35953555.

It is an arithmetic number, because the mean of its divisors is an integer number (35953555).

Almost surely, 2^71907109 is an apocalyptic number.

It is an amenable number.

71907109 is a deficient number, since it is larger than the sum of its proper divisors (1).

71907109 is an equidigital number, since it uses as much as digits as its factorization.

71907109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3969, while the sum is 34.

The square root of 71907109 is about 8479.8059529685. The cubic root of 71907109 is about 415.8377792206.

The spelling of 71907109 in words is "seventy-one million, nine hundred seven thousand, one hundred nine".