71571139 has 6 divisors (see below), whose sum is σ = 76029164. Its totient is φ = 67360800.

The previous prime is 71571127. The next prime is 71571163. The reversal of 71571139 is 93117517.

It is not a de Polignac number, because 71571139 - 2¹⁹ = 71046851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71571109) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 123537 + ... + 124114.

Almost surely, 2^71571139 is an apocalyptic number.

71571139 is a deficient number, since it is larger than the sum of its proper divisors (4458025).

71571139 is a wasteful number, since it uses less digits than its factorization.

71571139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247685 (or 247668 counting only the distinct ones).

The product of its digits is 6615, while the sum is 34.

The square root of 71571139 is about 8459.9727540932. The cubic root of 71571139 is about 415.1891313858.

The spelling of 71571139 in words is "seventy-one million, five hundred seventy-one thousand, one hundred thirty-nine".