231665516 has 12 divisors (see below), whose sum is σ = 405647088. Its totient is φ = 115766352.

The previous prime is 231665513. The next prime is 231665527. The reversal of 231665516 is 615566132.

231665516 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×231665516² = 107337822607092512, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (231665513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8291 + ... + 23066.

It is an arithmetic number, because the mean of its divisors is an integer number (33803924).

Almost surely, 2^231665516 is an apocalyptic number.

It is an amenable number.

231665516 is a deficient number, since it is larger than the sum of its proper divisors (173981572).

231665516 is a wasteful number, since it uses less digits than its factorization.

231665516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33208 (or 33206 counting only the distinct ones).

The product of its digits is 32400, while the sum is 35.

The square root of 231665516 is about 15220.5622760790. The cubic root of 231665516 is about 614.1679240219.

It can be divided in two parts, 23166 and 5516, that added together give a palindrome (28682).

The spelling of 231665516 in words is "two hundred thirty-one million, six hundred sixty-five thousand, five hundred sixteen".