71018231 has 4 divisors (see below), whose sum is σ = 75195792. Its totient is φ = 66840672.

The previous prime is 71018209. The next prime is 71018237. The reversal of 71018231 is 13281017.

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-71018231 is a prime.

It is a super-2 number, since 2×71018231² = 10087178268738722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71018197 and 71018206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71018237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2088755 + ... + 2088788.

It is an arithmetic number, because the mean of its divisors is an integer number (18798948).

Almost surely, 2^71018231 is an apocalyptic number.

71018231 is a deficient number, since it is larger than the sum of its proper divisors (4177561).

71018231 is a wasteful number, since it uses less digits than its factorization.

71018231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4177560.

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 71018231 is about 8427.2315145604. The cubic root of 71018231 is about 414.1172138098.

Adding to 71018231 its reverse (13281017), we get a palindrome (84299248).

The spelling of 71018231 in words is "seventy-one million, eighteen thousand, two hundred thirty-one".