71128481 has 4 divisors (see below), whose sum is σ = 72863364. Its totient is φ = 69393600.

The previous prime is 71128469. The next prime is 71128487. The reversal of 71128481 is 18482117.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 30691600 + 40436881 = 5540^2 + 6359^2 .

It is a cyclic number.

It is not a de Polignac number, because 71128481 - 2⁶ = 71128417 is a prime.

It is a super-2 number, since 2×71128481² = 10118521618734722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71128487) 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 in 3 ways as a sum of consecutive naturals, for example, 867380 + ... + 867461.

It is an arithmetic number, because the mean of its divisors is an integer number (18215841).

Almost surely, 2^71128481 is an apocalyptic number.

It is an amenable number.

71128481 is a deficient number, since it is larger than the sum of its proper divisors (1734883).

71128481 is a wasteful number, since it uses less digits than its factorization.

71128481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1734882.

The product of its digits is 3584, while the sum is 32.

The square root of 71128481 is about 8433.7702719484. The cubic root of 71128481 is about 414.3313973914.

It can be divided in two parts, 711 and 28481, that added together give a palindrome (29192).

The spelling of 71128481 in words is "seventy-one million, one hundred twenty-eight thousand, four hundred eighty-one".