71238513 has 4 divisors (see below), whose sum is σ = 94984688. Its totient is φ = 47492340.

The previous prime is 71238499. The next prime is 71238533. The reversal of 71238513 is 31583217.

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 71238513 - 2⁸ = 71238257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71238533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11873083 + ... + 11873088.

It is an arithmetic number, because the mean of its divisors is an integer number (23746172).

Almost surely, 2^71238513 is an apocalyptic number.

It is an amenable number.

71238513 is a deficient number, since it is larger than the sum of its proper divisors (23746175).

71238513 is a wasteful number, since it uses less digits than its factorization.

71238513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23746174.

The product of its digits is 5040, while the sum is 30.

The square root of 71238513 is about 8440.2910494840. The cubic root of 71238513 is about 414.5449369074.

The spelling of 71238513 in words is "seventy-one million, two hundred thirty-eight thousand, five hundred thirteen".