71416521 has 12 divisors (see below), whose sum is σ = 112535280. Its totient is φ = 43282680.

The previous prime is 71416517. The next prime is 71416561. The reversal of 71416521 is 12561417.

It is a happy number.

71416521 is a `hidden beast` number, since 7 + 1 + 4 + 1 + 652 + 1 = 666.

It is not a de Polignac number, because 71416521 - 2² = 71416517 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71416511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 360591 + ... + 360788.

It is an arithmetic number, because the mean of its divisors is an integer number (9377940).

Almost surely, 2^71416521 is an apocalyptic number.

It is an amenable number.

71416521 is a deficient number, since it is larger than the sum of its proper divisors (41118759).

71416521 is a wasteful number, since it uses less digits than its factorization.

71416521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721396 (or 721393 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 71416521 is about 8450.8296042460. The cubic root of 71416521 is about 414.8899325850.

Adding to 71416521 its reverse (12561417), we get a palindrome (83977938).

The spelling of 71416521 in words is "seventy-one million, four hundred sixteen thousand, five hundred twenty-one".