71144657 has 2 divisors, whose sum is σ = 71144658. Its totient is φ = 71144656.

The previous prime is 71144653. The next prime is 71144663. The reversal of 71144657 is 75644117.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63504961 + 7639696 = 7969^2 + 2764^2 .

It is a cyclic number.

It is not a de Polignac number, because 71144657 - 2² = 71144653 is a prime.

It is not a weakly prime, because it can be changed into another prime (71144651) 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 as a sum of consecutive naturals, namely, 35572328 + 35572329.

It is an arithmetic number, because the mean of its divisors is an integer number (35572329).

Almost surely, 2^71144657 is an apocalyptic number.

It is an amenable number.

71144657 is a deficient number, since it is larger than the sum of its proper divisors (1).

71144657 is an equidigital number, since it uses as much as digits as its factorization.

71144657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23520, while the sum is 35.

The square root of 71144657 is about 8434.7292191273. The cubic root of 71144657 is about 414.3628040168.

The spelling of 71144657 in words is "seventy-one million, one hundred forty-four thousand, six hundred fifty-seven".