71905149 has 6 divisors (see below), whose sum is σ = 103863006. Its totient is φ = 47936760.

The previous prime is 71905133. The next prime is 71905157. The reversal of 71905149 is 94150917.

It can be written as a sum of positive squares in only one way, i.e., 71825625 + 79524 = 8475^2 + 282^2 .

It is not a de Polignac number, because 71905149 - 2⁴ = 71905133 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71905109) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3994722 + ... + 3994739.

It is an arithmetic number, because the mean of its divisors is an integer number (17310501).

Almost surely, 2^71905149 is an apocalyptic number.

It is an amenable number.

71905149 is a deficient number, since it is larger than the sum of its proper divisors (31957857).

71905149 is a wasteful number, since it uses less digits than its factorization.

71905149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7989467 (or 7989464 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 36.

The square root of 71905149 is about 8479.6903834987. The cubic root of 71905149 is about 415.8340009690.

The spelling of 71905149 in words is "seventy-one million, nine hundred five thousand, one hundred forty-nine".