71281061 has 2 divisors, whose sum is σ = 71281062. Its totient is φ = 71281060.

The previous prime is 71281039. The next prime is 71281073. The reversal of 71281061 is 16018217.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67404100 + 3876961 = 8210^2 + 1969^2 .

It is a cyclic number.

It is not a de Polignac number, because 71281061 - 2¹⁰ = 71280037 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71281061.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71281261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35640530 + 35640531.

It is an arithmetic number, because the mean of its divisors is an integer number (35640531).

Almost surely, 2^71281061 is an apocalyptic number.

It is an amenable number.

71281061 is a deficient number, since it is larger than the sum of its proper divisors (1).

71281061 is an equidigital number, since it uses as much as digits as its factorization.

71281061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 71281061 is about 8442.8112024373. The cubic root of 71281061 is about 414.6274510180.

Adding to 71281061 its reverse (16018217), we get a palindrome (87299278).

The spelling of 71281061 in words is "seventy-one million, two hundred eighty-one thousand, sixty-one".