71009605 has 4 divisors (see below), whose sum is σ = 85211532. Its totient is φ = 56807680.

The previous prime is 71009599. The next prime is 71009633. The reversal of 71009605 is 50690017.

It is a happy number.

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 53919649 + 17089956 = 7343^2 + 4134^2 .

It is not a de Polignac number, because 71009605 - 2⁹ = 71009093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7100956 + ... + 7100965.

It is an arithmetic number, because the mean of its divisors is an integer number (21302883).

Almost surely, 2^71009605 is an apocalyptic number.

It is an amenable number.

71009605 is a deficient number, since it is larger than the sum of its proper divisors (14201927).

71009605 is a wasteful number, since it uses less digits than its factorization.

71009605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14201926.

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 71009605 is about 8426.7197057930. The cubic root of 71009605 is about 414.1004466611.

The spelling of 71009605 in words is "seventy-one million, nine thousand, six hundred five".