71438513 has 8 divisors (see below), whose sum is σ = 74445480. Its totient is φ = 68467840.

The previous prime is 71438429. The next prime is 71438531. The reversal of 71438513 is 31583417.

It can be written as a sum of positive squares in 4 ways, for example, as 37063744 + 34374769 = 6088^2 + 5863^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 71438513 - 2¹⁰ = 71437489 is a prime.

It is a super-2 number, since 2×71438513² = 10206922279302338, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71438513.

It is not an unprimeable number, because it can be changed into a prime (71438533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5018 + ... + 12963.

It is an arithmetic number, because the mean of its divisors is an integer number (9305685).

Almost surely, 2^71438513 is an apocalyptic number.

It is an amenable number.

71438513 is a deficient number, since it is larger than the sum of its proper divisors (3006967).

71438513 is a wasteful number, since it uses less digits than its factorization.

71438513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18147.

The product of its digits is 10080, while the sum is 32.

The square root of 71438513 is about 8452.1306781190. The cubic root of 71438513 is about 414.9325152762.

The spelling of 71438513 in words is "seventy-one million, four hundred thirty-eight thousand, five hundred thirteen".