71145121 has 2 divisors, whose sum is σ = 71145122. Its totient is φ = 71145120.

The previous prime is 71145079. The next prime is 71145163. The reversal of 71145121 is 12154117.

It is a balanced prime because it is at equal distance from previous prime (71145079) and next prime (71145163).

It can be written as a sum of positive squares in only one way, i.e., 66194496 + 4950625 = 8136^2 + 2225^2 .

It is an emirp because it is prime and its reverse (12154117) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71145121 - 2¹¹ = 71143073 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71145092 and 71145101.

It is not a weakly prime, because it can be changed into another prime (71145181) 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, 35572560 + 35572561.

It is an arithmetic number, because the mean of its divisors is an integer number (35572561).

Almost surely, 2^71145121 is an apocalyptic number.

It is an amenable number.

71145121 is a deficient number, since it is larger than the sum of its proper divisors (1).

71145121 is an equidigital number, since it uses as much as digits as its factorization.

71145121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 280, while the sum is 22.

The square root of 71145121 is about 8434.7567244112. The cubic root of 71145121 is about 414.3637048290.

Adding to 71145121 its reverse (12154117), we get a palindrome (83299238).

The spelling of 71145121 in words is "seventy-one million, one hundred forty-five thousand, one hundred twenty-one".