71536321 has 4 divisors (see below), whose sum is σ = 71896000. Its totient is φ = 71176644.

The previous prime is 71536307. The next prime is 71536447. The reversal of 71536321 is 12363517.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 71536321 - 2⁹ = 71535809 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71536321.

It is not an unprimeable number, because it can be changed into a prime (71536921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 179541 + ... + 179938.

It is an arithmetic number, because the mean of its divisors is an integer number (17974000).

Almost surely, 2^71536321 is an apocalyptic number.

It is an amenable number.

71536321 is a deficient number, since it is larger than the sum of its proper divisors (359679).

71536321 is a wasteful number, since it uses less digits than its factorization.

71536321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359678.

The product of its digits is 3780, while the sum is 28.

The square root of 71536321 is about 8457.9146957155. The cubic root of 71536321 is about 415.1217932557.

Adding to 71536321 its reverse (12363517), we get a palindrome (83899838).

The spelling of 71536321 in words is "seventy-one million, five hundred thirty-six thousand, three hundred twenty-one".