71351381 has 4 divisors (see below), whose sum is σ = 71872332. Its totient is φ = 70830432.

The previous prime is 71351347. The next prime is 71351383. The reversal of 71351381 is 18315317.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 57138481 + 14212900 = 7559^2 + 3770^2 .

It is a cyclic number.

It is not a de Polignac number, because 71351381 - 2⁶ = 71351317 is a prime.

It is a super-2 number, since 2×71351381² = 10182039141214322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71351383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 260270 + ... + 260543.

It is an arithmetic number, because the mean of its divisors is an integer number (17968083).

Almost surely, 2^71351381 is an apocalyptic number.

It is an amenable number.

71351381 is a deficient number, since it is larger than the sum of its proper divisors (520951).

71351381 is a wasteful number, since it uses less digits than its factorization.

71351381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520950.

The product of its digits is 2520, while the sum is 29.

The square root of 71351381 is about 8446.9746655237. The cubic root of 71351381 is about 414.7637519249.

Adding to 71351381 its reverse (18315317), we get a palindrome (89666698).

The spelling of 71351381 in words is "seventy-one million, three hundred fifty-one thousand, three hundred eighty-one".