71139385 has 4 divisors (see below), whose sum is σ = 85367268. Its totient is φ = 56911504.

The previous prime is 71139379. The next prime is 71139403. The reversal of 71139385 is 58393117.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58393117 = 3769 ⋅15493.

It can be written as a sum of positive squares in 2 ways, for example, as 17732521 + 53406864 = 4211^2 + 7308^2 .

It is a cyclic number.

It is not a de Polignac number, because 71139385 - 2³ = 71139377 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 7113934 + ... + 7113943.

It is an arithmetic number, because the mean of its divisors is an integer number (21341817).

Almost surely, 2^71139385 is an apocalyptic number.

It is an amenable number.

71139385 is a deficient number, since it is larger than the sum of its proper divisors (14227883).

71139385 is a wasteful number, since it uses less digits than its factorization.

71139385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14227882.

The product of its digits is 22680, while the sum is 37.

The square root of 71139385 is about 8434.4166958955. The cubic root of 71139385 is about 414.3525686515.

The spelling of 71139385 in words is "seventy-one million, one hundred thirty-nine thousand, three hundred eighty-five".