71526321 has 12 divisors (see below), whose sum is σ = 107142672. Its totient is φ = 47684052.

The previous prime is 71526289. The next prime is 71526347. The reversal of 71526321 is 12362517.

It is a happy number.

It is not a de Polignac number, because 71526321 - 2⁵ = 71526289 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71526391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 146931 + ... + 147416.

It is an arithmetic number, because the mean of its divisors is an integer number (8928556).

Almost surely, 2^71526321 is an apocalyptic number.

It is an amenable number.

71526321 is a deficient number, since it is larger than the sum of its proper divisors (35616351).

71526321 is an equidigital number, since it uses as much as digits as its factorization.

71526321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294362 (or 294350 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 71526321 is about 8457.3235127906. The cubic root of 71526321 is about 415.1024491830.

Adding to 71526321 its reverse (12362517), we get a palindrome (83888838).

The spelling of 71526321 in words is "seventy-one million, five hundred twenty-six thousand, three hundred twenty-one".