71145139 has 16 divisors (see below), whose sum is σ = 81396000. Its totient is φ = 61641216.

The previous prime is 71145121. The next prime is 71145163. The reversal of 71145139 is 93154117.

It is not a de Polignac number, because 71145139 - 2²³ = 62756531 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71145139.

It is not an unprimeable number, because it can be changed into a prime (71145539) 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, 26637 + ... + 29185.

It is an arithmetic number, because the mean of its divisors is an integer number (5087250).

Almost surely, 2^71145139 is an apocalyptic number.

71145139 is a deficient number, since it is larger than the sum of its proper divisors (10250861).

71145139 is a wasteful number, since it uses less digits than its factorization.

71145139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2694.

The product of its digits is 3780, while the sum is 31.

The square root of 71145139 is about 8434.7577914247. The cubic root of 71145139 is about 414.3637397743.

The spelling of 71145139 in words is "seventy-one million, one hundred forty-five thousand, one hundred thirty-nine".