71310521 has 8 divisors (see below), whose sum is σ = 73198944. Its totient is φ = 69429280.

The previous prime is 71310497. The next prime is 71310523. The reversal of 71310521 is 12501317.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71310521 - 2⁶ = 71310457 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71310493 and 71310502.

It is not an unprimeable number, because it can be changed into a prime (71310523) 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, 22586 + ... + 25548.

It is an arithmetic number, because the mean of its divisors is an integer number (9149868).

Almost surely, 2^71310521 is an apocalyptic number.

It is an amenable number.

71310521 is a deficient number, since it is larger than the sum of its proper divisors (1888423).

71310521 is a wasteful number, since it uses less digits than its factorization.

71310521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3591.

The product of its (nonzero) digits is 210, while the sum is 20.

The square root of 71310521 is about 8444.5557017525. Note that the first 3 decimals coincide. The cubic root of 71310521 is about 414.6845640957.

Adding to 71310521 its reverse (12501317), we get a palindrome (83811838).

The spelling of 71310521 in words is "seventy-one million, three hundred ten thousand, five hundred twenty-one".