71023231 has 4 divisors (see below), whose sum is σ = 71206200. Its totient is φ = 70840264.

The previous prime is 71023219. The next prime is 71023237. The reversal of 71023231 is 13232017.

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

It is a cyclic number.

It is not a de Polignac number, because 71023231 - 2²³ = 62634623 is a prime.

It is a super-2 number, since 2×71023231² = 10088598683358722, 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 = 71023199 and 71023208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71023237) 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, 90901 + ... + 91678.

It is an arithmetic number, because the mean of its divisors is an integer number (17801550).

Almost surely, 2^71023231 is an apocalyptic number.

71023231 is a deficient number, since it is larger than the sum of its proper divisors (182969).

71023231 is a wasteful number, since it uses less digits than its factorization.

71023231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182968.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 71023231 is about 8427.5281666690. The cubic root of 71023231 is about 414.1269321477.

Adding to 71023231 its reverse (13232017), we get a palindrome (84255248).

It can be divided in two parts, 7 and 1023231, that multiplied together give a palindrome (7162617).

The spelling of 71023231 in words is "seventy-one million, twenty-three thousand, two hundred thirty-one".