71272521 has 8 divisors (see below), whose sum is σ = 105588960. Its totient is φ = 47514996.

The previous prime is 71272519. The next prime is 71272547. The reversal of 71272521 is 12527217.

71272521 is a `hidden beast` number, since 71 + 2 + 72 + 521 = 666.

It is not a de Polignac number, because 71272521 - 2¹ = 71272519 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 2639723 = 71272521 / (7 + 1 + 2 + 7 + 2 + 5 + 2 + 1).

It is not an unprimeable number, because it can be changed into a prime (71272321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1319835 + ... + 1319888.

It is an arithmetic number, because the mean of its divisors is an integer number (13198620).

Almost surely, 2^71272521 is an apocalyptic number.

It is an amenable number.

71272521 is a deficient number, since it is larger than the sum of its proper divisors (34316439).

71272521 is a wasteful number, since it uses less digits than its factorization.

71272521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2639732 (or 2639726 counting only the distinct ones).

The product of its digits is 1960, while the sum is 27.

The square root of 71272521 is about 8442.3054315750. The cubic root of 71272521 is about 414.6108918750.

Adding to 71272521 its reverse (12527217), we get a palindrome (83799738).

The spelling of 71272521 in words is "seventy-one million, two hundred seventy-two thousand, five hundred twenty-one".