71386913 has 4 divisors (see below), whose sum is σ = 76878228. Its totient is φ = 65895600.

The previous prime is 71386907. The next prime is 71386957. The reversal of 71386913 is 31968317.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31968317 = 19 ⋅1682543.

It can be written as a sum of positive squares in 2 ways, for example, as 4032064 + 67354849 = 2008^2 + 8207^2 .

It is a cyclic number.

It is not a de Polignac number, because 71386913 - 2⁸ = 71386657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71386993) 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, 2745638 + ... + 2745663.

It is an arithmetic number, because the mean of its divisors is an integer number (19219557).

Almost surely, 2^71386913 is an apocalyptic number.

It is an amenable number.

71386913 is a deficient number, since it is larger than the sum of its proper divisors (5491315).

71386913 is a wasteful number, since it uses less digits than its factorization.

71386913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5491314.

The product of its digits is 27216, while the sum is 38.

The square root of 71386913 is about 8449.0776419678. The cubic root of 71386913 is about 414.8325893684.

The spelling of 71386913 in words is "seventy-one million, three hundred eighty-six thousand, nine hundred thirteen".