71455861 has 2 divisors, whose sum is σ = 71455862. Its totient is φ = 71455860.

The previous prime is 71455849. The next prime is 71455877. The reversal of 71455861 is 16855417.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71402500 + 53361 = 8450^2 + 231^2 .

It is an emirp because it is prime and its reverse (16855417) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71455861 - 2⁵ = 71455829 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71455861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71455061) 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, 35727930 + 35727931.

It is an arithmetic number, because the mean of its divisors is an integer number (35727931).

Almost surely, 2^71455861 is an apocalyptic number.

It is an amenable number.

71455861 is a deficient number, since it is larger than the sum of its proper divisors (1).

71455861 is an equidigital number, since it uses as much as digits as its factorization.

71455861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 33600, while the sum is 37.

The square root of 71455861 is about 8453.1568659288. The cubic root of 71455861 is about 414.9660997131.

The spelling of 71455861 in words is "seventy-one million, four hundred fifty-five thousand, eight hundred sixty-one".