71386513 has 4 divisors (see below), whose sum is σ = 77876208. Its totient is φ = 64896820.

The previous prime is 71386499. The next prime is 71386517. The reversal of 71386513 is 31568317.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 71386513 - 2²¹ = 69289361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71386517) 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, 3244831 + ... + 3244852.

It is an arithmetic number, because the mean of its divisors is an integer number (19469052).

Almost surely, 2^71386513 is an apocalyptic number.

It is an amenable number.

71386513 is a deficient number, since it is larger than the sum of its proper divisors (6489695).

71386513 is a wasteful number, since it uses less digits than its factorization.

71386513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6489694.

The product of its digits is 15120, while the sum is 34.

The square root of 71386513 is about 8449.0539707118. The cubic root of 71386513 is about 414.8318145609.

The spelling of 71386513 in words is "seventy-one million, three hundred eighty-six thousand, five hundred thirteen".