71608221 has 12 divisors (see below), whose sum is σ = 107001180. Its totient is φ = 46092480.

The previous prime is 71608219. The next prime is 71608231. The reversal of 71608221 is 12280617.

It can be written as a sum of positive squares in 2 ways, for example, as 14907321 + 56700900 = 3861^2 + 7530^2 .

It is not a de Polignac number, because 71608221 - 2¹ = 71608219 is a prime.

It is a super-3 number, since 3×71608221³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71608231) 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, 136920 + ... + 137441.

It is an arithmetic number, because the mean of its divisors is an integer number (8916765).

Almost surely, 2^71608221 is an apocalyptic number.

It is an amenable number.

71608221 is a deficient number, since it is larger than the sum of its proper divisors (35392959).

71608221 is a wasteful number, since it uses less digits than its factorization.

71608221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274396 (or 274393 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 71608221 is about 8462.1640849135. The cubic root of 71608221 is about 415.2608240884.

Adding to 71608221 its reverse (12280617), we get a palindrome (83888838).

The spelling of 71608221 in words is "seventy-one million, six hundred eight thousand, two hundred twenty-one".