71709811 has 4 divisors (see below), whose sum is σ = 73647952. Its totient is φ = 69771672.

The previous prime is 71709809. The next prime is 71709823. The reversal of 71709811 is 11890717.

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

It is a cyclic number.

It is not a de Polignac number, because 71709811 - 2¹ = 71709809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71709511) 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, 969015 + ... + 969088.

It is an arithmetic number, because the mean of its divisors is an integer number (18411988).

Almost surely, 2^71709811 is an apocalyptic number.

71709811 is a deficient number, since it is larger than the sum of its proper divisors (1938141).

71709811 is a wasteful number, since it uses less digits than its factorization.

71709811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1938140.

The product of its (nonzero) digits is 3528, while the sum is 34.

The square root of 71709811 is about 8468.1645591002. The cubic root of 71709811 is about 415.4571070125.

The spelling of 71709811 in words is "seventy-one million, seven hundred nine thousand, eight hundred eleven".