71642231 has 4 divisors (see below), whose sum is σ = 71773752. Its totient is φ = 71510712.

The previous prime is 71642227. The next prime is 71642237. The reversal of 71642231 is 13224617.

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 71642231 - 2² = 71642227 is a prime.

It is a super-2 number, since 2×71642231² = 10265218525314722, 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 71642231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71642237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64940 + ... + 66033.

It is an arithmetic number, because the mean of its divisors is an integer number (17943438).

Almost surely, 2^71642231 is an apocalyptic number.

71642231 is a deficient number, since it is larger than the sum of its proper divisors (131521).

71642231 is a wasteful number, since it uses less digits than its factorization.

71642231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131520.

The product of its digits is 2016, while the sum is 26.

The square root of 71642231 is about 8464.1733796042. The cubic root of 71642231 is about 415.3265557653.

Adding to 71642231 its reverse (13224617), we get a palindrome (84866848).

The spelling of 71642231 in words is "seventy-one million, six hundred forty-two thousand, two hundred thirty-one".