71705861 has 4 divisors (see below), whose sum is σ = 71961324. Its totient is φ = 71450400.

The previous prime is 71705839. The next prime is 71705891. The reversal of 71705861 is 16850717.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16850717 = 13 ⋅1296209.

It can be written as a sum of positive squares in 2 ways, for example, as 42003361 + 29702500 = 6481^2 + 5450^2 .

It is a cyclic number.

It is not a de Polignac number, because 71705861 - 2⁶ = 71705797 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 (71705831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127310 + ... + 127871.

It is an arithmetic number, because the mean of its divisors is an integer number (17990331).

Almost surely, 2^71705861 is an apocalyptic number.

It is an amenable number.

71705861 is a deficient number, since it is larger than the sum of its proper divisors (255463).

71705861 is a wasteful number, since it uses less digits than its factorization.

71705861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255462.

The product of its (nonzero) digits is 11760, while the sum is 35.

The square root of 71705861 is about 8467.9313294334. The cubic root of 71705861 is about 415.4494786481.

It can be divided in two parts, 7170 and 5861, that added together give a palindrome (13031).

The spelling of 71705861 in words is "seventy-one million, seven hundred five thousand, eight hundred sixty-one".