71916109 has 2 divisors, whose sum is σ = 71916110. Its totient is φ = 71916108.

The previous prime is 71916079. The next prime is 71916179. The reversal of 71916109 is 90161917.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36036009 + 35880100 = 6003^2 + 5990^2 .

It is a cyclic number.

It is not a de Polignac number, because 71916109 - 2⁵ = 71916077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71916179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35958054 + 35958055.

It is an arithmetic number, because the mean of its divisors is an integer number (35958055).

Almost surely, 2^71916109 is an apocalyptic number.

It is an amenable number.

71916109 is a deficient number, since it is larger than the sum of its proper divisors (1).

71916109 is an equidigital number, since it uses as much as digits as its factorization.

71916109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3402, while the sum is 34.

The square root of 71916109 is about 8480.3366088853. The cubic root of 71916109 is about 415.8551274538.

The spelling of 71916109 in words is "seventy-one million, nine hundred sixteen thousand, one hundred nine".