71717081 has 4 divisors (see below), whose sum is σ = 71864832. Its totient is φ = 71569332.

The previous prime is 71717053. The next prime is 71717099. The reversal of 71717081 is 18071717.

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 71717081 - 2⁶ = 71717017 is a prime.

It is a super-2 number, since 2×71717081² = 10286679414321122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71710081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73145 + ... + 74118.

It is an arithmetic number, because the mean of its divisors is an integer number (17966208).

Almost surely, 2^71717081 is an apocalyptic number.

It is an amenable number.

71717081 is a deficient number, since it is larger than the sum of its proper divisors (147751).

71717081 is a wasteful number, since it uses less digits than its factorization.

71717081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147750.

The product of its (nonzero) digits is 2744, while the sum is 32.

The square root of 71717081 is about 8468.5938029876. The cubic root of 71717081 is about 415.4711463332.

Adding to 71717081 its reverse (18071717), we get a palindrome (89788798).

The spelling of 71717081 in words is "seventy-one million, seven hundred seventeen thousand, eighty-one".