71402561 has 2 divisors, whose sum is σ = 71402562. Its totient is φ = 71402560.

The previous prime is 71402543. The next prime is 71402609. The reversal of 71402561 is 16520417.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66912400 + 4490161 = 8180^2 + 2119^2 .

It is a cyclic number.

It is not a de Polignac number, because 71402561 - 2⁶ = 71402497 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71402561.

It is not a weakly prime, because it can be changed into another prime (71402761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35701280 + 35701281.

It is an arithmetic number, because the mean of its divisors is an integer number (35701281).

Almost surely, 2^71402561 is an apocalyptic number.

It is an amenable number.

71402561 is a deficient number, since it is larger than the sum of its proper divisors (1).

71402561 is an equidigital number, since it uses as much as digits as its factorization.

71402561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 71402561 is about 8450.0036094667. The cubic root of 71402561 is about 414.8628975666.

Adding to 71402561 its reverse (16520417), we get a palindrome (87922978).

The spelling of 71402561 in words is "seventy-one million, four hundred two thousand, five hundred sixty-one".