71534231 has 4 divisors (see below), whose sum is σ = 71694000. Its totient is φ = 71374464.

The previous prime is 71534227. The next prime is 71534251. The reversal of 71534231 is 13243517.

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 71534231 - 2² = 71534227 is a prime.

It is a super-2 number, since 2×71534231² = 10234292409522722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71534231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71534201) 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, 79211 + ... + 80108.

It is an arithmetic number, because the mean of its divisors is an integer number (17923500).

Almost surely, 2^71534231 is an apocalyptic number.

71534231 is a deficient number, since it is larger than the sum of its proper divisors (159769).

71534231 is a wasteful number, since it uses less digits than its factorization.

71534231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159768.

The product of its digits is 2520, while the sum is 26.

The square root of 71534231 is about 8457.7911418999. The cubic root of 71534231 is about 415.1177504935.

Adding to 71534231 its reverse (13243517), we get a palindrome (84777748).

The spelling of 71534231 in words is "seventy-one million, five hundred thirty-four thousand, two hundred thirty-one".