71123661 has 12 divisors (see below), whose sum is σ = 117410592. Its totient is φ = 40642056.

The previous prime is 71123653. The next prime is 71123671. The reversal of 71123661 is 16632117.

It is not a de Polignac number, because 71123661 - 2³ = 71123653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71123651) 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, 564411 + ... + 564536.

It is an arithmetic number, because the mean of its divisors is an integer number (9784216).

Almost surely, 2^71123661 is an apocalyptic number.

It is an amenable number.

71123661 is a deficient number, since it is larger than the sum of its proper divisors (46286931).

71123661 is a wasteful number, since it uses less digits than its factorization.

71123661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1128960 (or 1128957 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 71123661 is about 8433.4845111614. The cubic root of 71123661 is about 414.3220381661.

Adding to 71123661 its reverse (16632117), we get a palindrome (87755778).

The spelling of 71123661 in words is "seventy-one million, one hundred twenty-three thousand, six hundred sixty-one".