71162221 has 8 divisors (see below), whose sum is σ = 81144504. Its totient is φ = 61824000.

The previous prime is 71162219. The next prime is 71162227. The reversal of 71162221 is 12226117.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 12996 + 71149225 = 114^2 + 8435^2 .

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 71162221 - 2¹ = 71162219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71162192 and 71162201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71162227) 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, 160780 + ... + 161221.

It is an arithmetic number, because the mean of its divisors is an integer number (10143063).

Almost surely, 2^71162221 is an apocalyptic number.

It is an amenable number.

71162221 is a deficient number, since it is larger than the sum of its proper divisors (9982283).

71162221 is a wasteful number, since it uses less digits than its factorization.

71162221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322031.

The product of its digits is 336, while the sum is 22.

The square root of 71162221 is about 8435.7703264136. The cubic root of 71162221 is about 414.3969001330.

Adding to 71162221 its reverse (12226117), we get a palindrome (83388338).

The spelling of 71162221 in words is "seventy-one million, one hundred sixty-two thousand, two hundred twenty-one".