71023521 has 8 divisors (see below), whose sum is σ = 97007904. Its totient is φ = 46194080.

The previous prime is 71023499. The next prime is 71023543. The reversal of 71023521 is 12532017.

It is an interprime number because it is at equal distance from previous prime (71023499) and next prime (71023543).

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 71023521 - 2⁵ = 71023489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71023591) 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, 288591 + ... + 288836.

It is an arithmetic number, because the mean of its divisors is an integer number (12125988).

Almost surely, 2^71023521 is an apocalyptic number.

It is an amenable number.

71023521 is a deficient number, since it is larger than the sum of its proper divisors (25984383).

71023521 is a wasteful number, since it uses less digits than its factorization.

71023521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577471.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 71023521 is about 8427.5453721710. The cubic root of 71023521 is about 414.1274957972.

Adding to 71023521 its reverse (12532017), we get a palindrome (83555538).

The spelling of 71023521 in words is "seventy-one million, twenty-three thousand, five hundred twenty-one".