71009173 has 4 divisors (see below), whose sum is σ = 71029120. Its totient is φ = 70989228.

The previous prime is 71009167. The next prime is 71009177. The reversal of 71009173 is 37190017.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 71009173 - 2¹³ = 71000981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71009177) 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 3 ways as a sum of consecutive naturals, for example, 3015 + ... + 12292.

It is an arithmetic number, because the mean of its divisors is an integer number (17757280).

Almost surely, 2^71009173 is an apocalyptic number.

It is an amenable number.

71009173 is a deficient number, since it is larger than the sum of its proper divisors (19947).

71009173 is a wasteful number, since it uses less digits than its factorization.

71009173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19946.

The product of its (nonzero) digits is 1323, while the sum is 28.

The square root of 71009173 is about 8426.6940730040. The cubic root of 71009173 is about 414.0996069073.

The spelling of 71009173 in words is "seventy-one million, nine thousand, one hundred seventy-three".