71641261 has 2 divisors, whose sum is σ = 71641262. Its totient is φ = 71641260.

The previous prime is 71641249. The next prime is 71641303. The reversal of 71641261 is 16214617.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51337225 + 20304036 = 7165^2 + 4506^2 .

It is a cyclic number.

It is not a de Polignac number, because 71641261 - 2¹⁷ = 71510189 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71641211) 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 as a sum of consecutive naturals, namely, 35820630 + 35820631.

It is an arithmetic number, because the mean of its divisors is an integer number (35820631).

Almost surely, 2^71641261 is an apocalyptic number.

It is an amenable number.

71641261 is a deficient number, since it is larger than the sum of its proper divisors (1).

71641261 is an equidigital number, since it uses as much as digits as its factorization.

71641261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 28.

The square root of 71641261 is about 8464.1160790717. The cubic root of 71641261 is about 415.3246813188.

Adding to 71641261 its reverse (16214617), we get a palindrome (87855878).

The spelling of 71641261 in words is "seventy-one million, six hundred forty-one thousand, two hundred sixty-one".