71139319 has 4 divisors (see below), whose sum is σ = 71830096. Its totient is φ = 70448544.

The previous prime is 71139311. The next prime is 71139323. The reversal of 71139319 is 91393117.

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

It is a cyclic number.

It is not a de Polignac number, because 71139319 - 2³ = 71139311 is a prime.

It is a super-2 number, since 2×71139319² = 10121605415567522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71139311) 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, 345234 + ... + 345439.

It is an arithmetic number, because the mean of its divisors is an integer number (17957524).

Almost surely, 2^71139319 is an apocalyptic number.

71139319 is a deficient number, since it is larger than the sum of its proper divisors (690777).

71139319 is a wasteful number, since it uses less digits than its factorization.

71139319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690776.

The product of its digits is 5103, while the sum is 34.

The square root of 71139319 is about 8434.4127833537. The cubic root of 71139319 is about 414.3524405121.

The spelling of 71139319 in words is "seventy-one million, one hundred thirty-nine thousand, three hundred nineteen".