71717161 has 2 divisors, whose sum is σ = 71717162. Its totient is φ = 71717160.

The previous prime is 71717147. The next prime is 71717183. The reversal of 71717161 is 16171717.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71301136 + 416025 = 8444^2 + 645^2 .

It is a cyclic number.

It is not a de Polignac number, because 71717161 - 2⁹ = 71716649 is a prime.

It is not a weakly prime, because it can be changed into another prime (71717111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35858580 + 35858581.

It is an arithmetic number, because the mean of its divisors is an integer number (35858581).

Almost surely, 2^71717161 is an apocalyptic number.

It is an amenable number.

71717161 is a deficient number, since it is larger than the sum of its proper divisors (1).

71717161 is an equidigital number, since it uses as much as digits as its factorization.

71717161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2058, while the sum is 31.

The square root of 71717161 is about 8468.5985263206. The cubic root of 71717161 is about 415.4713008184.

Adding to 71717161 its reverse (16171717), we get a palindrome (87888878).

It can be divided in two parts, 7171716 and 1, that added together give a palindrome (7171717).

The spelling of 71717161 in words is "seventy-one million, seven hundred seventeen thousand, one hundred sixty-one".