71708121 has 6 divisors (see below), whose sum is σ = 103578410. Its totient is φ = 47805408.

The previous prime is 71708111. The next prime is 71708141. The reversal of 71708121 is 12180717.

It can be written as a sum of positive squares in only one way, i.e., 51322896 + 20385225 = 7164^2 + 4515^2 .

It is not a de Polignac number, because 71708121 - 2⁹ = 71707609 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71708111) 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 in 5 ways as a sum of consecutive naturals, for example, 3983776 + ... + 3983793.

Almost surely, 2^71708121 is an apocalyptic number.

It is an amenable number.

71708121 is a deficient number, since it is larger than the sum of its proper divisors (31870289).

71708121 is a wasteful number, since it uses less digits than its factorization.

71708121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7967575 (or 7967572 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 27.

The square root of 71708121 is about 8468.0647730163. The cubic root of 71708121 is about 415.4538432656.

Adding to 71708121 its reverse (12180717), we get a palindrome (83888838).

The spelling of 71708121 in words is "seventy-one million, seven hundred eight thousand, one hundred twenty-one".