71280549 has 6 divisors (see below), whose sum is σ = 102960806. Its totient is φ = 47520360.

The previous prime is 71280499. The next prime is 71280569. The reversal of 71280549 is 94508217.

It can be written as a sum of positive squares in only one way, i.e., 61732449 + 9548100 = 7857^2 + 3090^2 .

It is not a de Polignac number, because 71280549 - 2⁷ = 71280421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71280569) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3960022 + ... + 3960039.

Almost surely, 2^71280549 is an apocalyptic number.

It is an amenable number.

71280549 is a deficient number, since it is larger than the sum of its proper divisors (31680257).

71280549 is a wasteful number, since it uses less digits than its factorization.

71280549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7920067 (or 7920064 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 71280549 is about 8442.7808807288. The cubic root of 71280549 is about 414.6264582823.

The spelling of 71280549 in words is "seventy-one million, two hundred eighty thousand, five hundred forty-nine".