71124857 has 4 divisors (see below), whose sum is σ = 71163300. Its totient is φ = 71086416.

The previous prime is 71124829. The next prime is 71124863. The reversal of 71124857 is 75842117.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26020201 + 45104656 = 5101^2 + 6716^2 .

It is a cyclic number.

It is not a de Polignac number, because 71124857 - 2⁶ = 71124793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71124817) 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, 16298 + ... + 20195.

It is an arithmetic number, because the mean of its divisors is an integer number (17790825).

Almost surely, 2^71124857 is an apocalyptic number.

It is an amenable number.

71124857 is a deficient number, since it is larger than the sum of its proper divisors (38443).

71124857 is a wasteful number, since it uses less digits than its factorization.

71124857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38442.

The product of its digits is 15680, while the sum is 35.

The square root of 71124857 is about 8433.5554186832. Note that the first 3 decimals coincide. The cubic root of 71124857 is about 414.3243605361.

It can be divided in two parts, 7 and 1124857, that added together give a cube (1124864 = 104³).

The spelling of 71124857 in words is "seventy-one million, one hundred twenty-four thousand, eight hundred fifty-seven".