71660231 has 16 divisors (see below), whose sum is σ = 76463904. Its totient is φ = 67060224.

The previous prime is 71660227. The next prime is 71660257. The reversal of 71660231 is 13206617.

It is a cyclic number.

It is not a de Polignac number, because 71660231 - 2² = 71660227 is a prime.

It is a super-2 number, since 2×71660231² = 10270377413946722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 71660231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71660261) 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 15 ways as a sum of consecutive naturals, for example, 115835 + ... + 116451.

It is an arithmetic number, because the mean of its divisors is an integer number (4778994).

Almost surely, 2^71660231 is an apocalyptic number.

71660231 is a deficient number, since it is larger than the sum of its proper divisors (4803673).

71660231 is a wasteful number, since it uses less digits than its factorization.

71660231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 770.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 71660231 is about 8465.2366180751. The cubic root of 71660231 is about 415.3613362381.

Adding to 71660231 its reverse (13206617), we get a palindrome (84866848).

The spelling of 71660231 in words is "seventy-one million, six hundred sixty thousand, two hundred thirty-one".