71459909 has 4 divisors (see below), whose sum is σ = 71479020. Its totient is φ = 71440800.

The previous prime is 71459897. The next prime is 71459911. The reversal of 71459909 is 90995417.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19936225 + 51523684 = 4465^2 + 7178^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71459909 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71459909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71450909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1904 + ... + 12105.

It is an arithmetic number, because the mean of its divisors is an integer number (17869755).

Almost surely, 2^71459909 is an apocalyptic number.

It is an amenable number.

71459909 is a deficient number, since it is larger than the sum of its proper divisors (19111).

71459909 is a wasteful number, since it uses less digits than its factorization.

71459909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19110.

The product of its (nonzero) digits is 102060, while the sum is 44.

The square root of 71459909 is about 8453.3962997129. The cubic root of 71459909 is about 414.9739355576.

The spelling of 71459909 in words is "seventy-one million, four hundred fifty-nine thousand, nine hundred nine".