231605017 has 12 divisors (see below), whose sum is σ = 270028836. Its totient is φ = 198068640.

The previous prime is 231604993. The next prime is 231605027. The reversal of 231605017 is 710506132.

It can be written as a sum of positive squares in 2 ways, for example, as 48706441 + 182898576 = 6979^2 + 13524^2 .

It is a de Polignac number, because none of the positive numbers 2^k-231605017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231604982 and 231605000.

It is not an unprimeable number, because it can be changed into a prime (231605027) 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 11 ways as a sum of consecutive naturals, for example, 17463 + ... + 27715.

It is an arithmetic number, because the mean of its divisors is an integer number (22502403).

Almost surely, 2^231605017 is an apocalyptic number.

It is an amenable number.

231605017 is a deficient number, since it is larger than the sum of its proper divisors (38423819).

231605017 is a wasteful number, since it uses less digits than its factorization.

231605017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10728 (or 10721 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 231605017 is about 15218.5747361571. The cubic root of 231605017 is about 614.1144564467.

The spelling of 231605017 in words is "two hundred thirty-one million, six hundred five thousand, seventeen".