71517513 has 4 divisors (see below), whose sum is σ = 95356688. Its totient is φ = 47678340.

The previous prime is 71517469. The next prime is 71517517. The reversal of 71517513 is 31571517.

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 not a de Polignac number, because 71517513 - 2⁶ = 71517449 is a prime.

It is a super-2 number, since 2×71517513² = 10229509331410338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71517517) 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, 11919583 + ... + 11919588.

It is an arithmetic number, because the mean of its divisors is an integer number (23839172).

Almost surely, 2^71517513 is an apocalyptic number.

It is an amenable number.

71517513 is a deficient number, since it is larger than the sum of its proper divisors (23839175).

71517513 is a wasteful number, since it uses less digits than its factorization.

71517513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23839174.

The product of its digits is 3675, while the sum is 30.

The square root of 71517513 is about 8456.8027646387. The cubic root of 71517513 is about 415.0854094303.

The spelling of 71517513 in words is "seventy-one million, five hundred seventeen thousand, five hundred thirteen".