71081617 has 4 divisors (see below), whose sum is σ = 71098480. Its totient is φ = 71064756.

The previous prime is 71081611. The next prime is 71081629. The reversal of 71081617 is 71618017.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 71081617 - 2¹⁵ = 71048849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71081611) 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, 4198 + ... + 12640.

It is an arithmetic number, because the mean of its divisors is an integer number (17774620).

Almost surely, 2^71081617 is an apocalyptic number.

It is an amenable number.

71081617 is a deficient number, since it is larger than the sum of its proper divisors (16863).

71081617 is an equidigital number, since it uses as much as digits as its factorization.

71081617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16862.

The product of its (nonzero) digits is 2352, while the sum is 31.

The square root of 71081617 is about 8430.9914600834. The cubic root of 71081617 is about 414.2403813768.

The spelling of 71081617 in words is "seventy-one million, eighty-one thousand, six hundred seventeen".