71045489 has 4 divisors (see below), whose sum is σ = 71406324. Its totient is φ = 70684656.

The previous prime is 71045479. The next prime is 71045501. The reversal of 71045489 is 98454017.

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 60964864 + 10080625 = 7808^2 + 3175^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71045489 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71045449) 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 in 3 ways as a sum of consecutive naturals, for example, 180122 + ... + 180515.

It is an arithmetic number, because the mean of its divisors is an integer number (17851581).

Almost surely, 2^71045489 is an apocalyptic number.

It is an amenable number.

71045489 is a deficient number, since it is larger than the sum of its proper divisors (360835).

71045489 is a wasteful number, since it uses less digits than its factorization.

71045489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360834.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 71045489 is about 8428.8486165075. The cubic root of 71045489 is about 414.1701887666.

The spelling of 71045489 in words is "seventy-one million, forty-five thousand, four hundred eighty-nine".