71961541 has 2 divisors, whose sum is σ = 71961542. Its totient is φ = 71961540.

The previous prime is 71961529. The next prime is 71961577. The reversal of 71961541 is 14516917.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69239041 + 2722500 = 8321^2 + 1650^2 .

It is an emirp because it is prime and its reverse (14516917) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71961541 - 2¹¹ = 71959493 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71961497 and 71961506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71961511) 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, 35980770 + 35980771.

It is an arithmetic number, because the mean of its divisors is an integer number (35980771).

Almost surely, 2^71961541 is an apocalyptic number.

It is an amenable number.

71961541 is a deficient number, since it is larger than the sum of its proper divisors (1).

71961541 is an equidigital number, since it uses as much as digits as its factorization.

71961541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7560, while the sum is 34.

The square root of 71961541 is about 8483.0148532229. The cubic root of 71961541 is about 415.9426792477.

The spelling of 71961541 in words is "seventy-one million, nine hundred sixty-one thousand, five hundred forty-one".