71063381 has 4 divisors (see below), whose sum is σ = 71516172. Its totient is φ = 70610592.

The previous prime is 71063359. The next prime is 71063387. The reversal of 71063381 is 18336017.

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 46362481 + 24700900 = 6809^2 + 4970^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71063381 is a prime.

It is a super-2 number, since 2×71063381² = 10100008238302322, 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 (71063387) 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, 226160 + ... + 226473.

It is an arithmetic number, because the mean of its divisors is an integer number (17879043).

Almost surely, 2^71063381 is an apocalyptic number.

It is an amenable number.

71063381 is a deficient number, since it is larger than the sum of its proper divisors (452791).

71063381 is a wasteful number, since it uses less digits than its factorization.

71063381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452790.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 71063381 is about 8429.9099046194. The cubic root of 71063381 is about 414.2049538687.

Adding to 71063381 its reverse (18336017), we get a palindrome (89399398).

The spelling of 71063381 in words is "seventy-one million, sixty-three thousand, three hundred eighty-one".