71148109 has 2 divisors, whose sum is σ = 71148110. Its totient is φ = 71148108.

The previous prime is 71148097. The next prime is 71148127. The reversal of 71148109 is 90184117.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62015625 + 9132484 = 7875^2 + 3022^2 .

It is a cyclic number.

It is not a de Polignac number, because 71148109 - 2⁷ = 71147981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71148199) 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, 35574054 + 35574055.

It is an arithmetic number, because the mean of its divisors is an integer number (35574055).

Almost surely, 2^71148109 is an apocalyptic number.

It is an amenable number.

71148109 is a deficient number, since it is larger than the sum of its proper divisors (1).

71148109 is an equidigital number, since it uses as much as digits as its factorization.

71148109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 31.

The square root of 71148109 is about 8434.9338468064. The cubic root of 71148109 is about 414.3695056551.

The spelling of 71148109 in words is "seventy-one million, one hundred forty-eight thousand, one hundred nine".