71043331 has 4 divisors (see below), whose sum is σ = 71348472. Its totient is φ = 70738192.

The previous prime is 71043319. The next prime is 71043347. The reversal of 71043331 is 13334017.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71043331 is a prime.

It is a super-2 number, since 2×71043331² = 10094309759151122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71043361) 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, 152221 + ... + 152686.

It is an arithmetic number, because the mean of its divisors is an integer number (17837118).

Almost surely, 2^71043331 is an apocalyptic number.

71043331 is a deficient number, since it is larger than the sum of its proper divisors (305141).

71043331 is a wasteful number, since it uses less digits than its factorization.

71043331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305140.

The product of its (nonzero) digits is 756, while the sum is 22.

The square root of 71043331 is about 8428.7206027961. The cubic root of 71043331 is about 414.1659952640.

Adding to 71043331 its reverse (13334017), we get a palindrome (84377348).

The spelling of 71043331 in words is "seventy-one million, forty-three thousand, three hundred thirty-one".