231016505 has 8 divisors (see below), whose sum is σ = 278769600. Its totient is φ = 183780016.

The previous prime is 231016483. The next prime is 231016507. The reversal of 231016505 is 505610132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 231016505 - 2⁸ = 231016249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (231016507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128165 + ... + 129954.

It is an arithmetic number, because the mean of its divisors is an integer number (34846200).

Almost surely, 2^231016505 is an apocalyptic number.

It is an amenable number.

231016505 is a deficient number, since it is larger than the sum of its proper divisors (47753095).

231016505 is a wasteful number, since it uses less digits than its factorization.

231016505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258303.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 231016505 is about 15199.2271185084. The cubic root of 231016505 is about 613.5938570748.

Adding to 231016505 its reverse (505610132), we get a palindrome (736626637).

The spelling of 231016505 in words is "two hundred thirty-one million, sixteen thousand, five hundred five".