71144661 has 16 divisors (see below), whose sum is σ = 110933504. Its totient is φ = 39708144.

The previous prime is 71144657. The next prime is 71144663. The reversal of 71144661 is 16644117.

It is not a de Polignac number, because 71144661 - 2² = 71144657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71144663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38491 + ... + 40296.

It is an arithmetic number, because the mean of its divisors is an integer number (6933344).

Almost surely, 2^71144661 is an apocalyptic number.

It is an amenable number.

71144661 is a deficient number, since it is larger than the sum of its proper divisors (39788843).

71144661 is a wasteful number, since it uses less digits than its factorization.

71144661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78840.

The product of its digits is 4032, while the sum is 30.

The square root of 71144661 is about 8434.7294562422. The cubic root of 71144661 is about 414.3628117825.

Adding to 71144661 its reverse (16644117), we get a palindrome (87788778).

The spelling of 71144661 in words is "seventy-one million, one hundred forty-four thousand, six hundred sixty-one".