71205641 has 8 divisors (see below), whose sum is σ = 76756680. Its totient is φ = 65665152.

The previous prime is 71205637. The next prime is 71205653. The reversal of 71205641 is 14650217.

It can be written as a sum of positive squares in 4 ways, for example, as 3225616 + 67980025 = 1796^2 + 8245^2 .

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 71205641 - 2² = 71205637 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71205641.

It is not an unprimeable number, because it can be changed into a prime (71205601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16661 + ... + 20493.

It is an arithmetic number, because the mean of its divisors is an integer number (9594585).

Almost surely, 2^71205641 is an apocalyptic number.

It is an amenable number.

71205641 is a deficient number, since it is larger than the sum of its proper divisors (5551039).

71205641 is a wasteful number, since it uses less digits than its factorization.

71205641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5275.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 71205641 is about 8438.3434985784. The cubic root of 71205641 is about 414.4811651398.

Adding to 71205641 its reverse (14650217), we get a palindrome (85855858).

The spelling of 71205641 in words is "seventy-one million, two hundred five thousand, six hundred forty-one".