71170861 has 2 divisors, whose sum is σ = 71170862. Its totient is φ = 71170860.

The previous prime is 71170811. The next prime is 71170877. The reversal of 71170861 is 16807117.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65853225 + 5317636 = 8115^2 + 2306^2 .

It is a cyclic number.

It is not a de Polignac number, because 71170861 - 2⁷ = 71170733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71170811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35585430 + 35585431.

It is an arithmetic number, because the mean of its divisors is an integer number (35585431).

Almost surely, 2^71170861 is an apocalyptic number.

It is an amenable number.

71170861 is a deficient number, since it is larger than the sum of its proper divisors (1).

71170861 is an equidigital number, since it uses as much as digits as its factorization.

71170861 is an odious number, because the sum of its binary digits is odd.

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

The square root of 71170861 is about 8436.2824158512. The cubic root of 71170861 is about 414.4136704748.

Adding to 71170861 its reverse (16807117), we get a palindrome (87977978).

The spelling of 71170861 in words is "seventy-one million, one hundred seventy thousand, eight hundred sixty-one".