231252609 has 24 divisors (see below), whose sum is σ = 363745728. Its totient is φ = 130277280.

The previous prime is 231252599. The next prime is 231252611. The reversal of 231252609 is 906252132.

It is not a de Polignac number, because 231252609 - 2¹⁵ = 231219841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (231252209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 642 + ... + 21515.

It is an arithmetic number, because the mean of its divisors is an integer number (15156072).

Almost surely, 2^231252609 is an apocalyptic number.

It is an amenable number.

231252609 is a deficient number, since it is larger than the sum of its proper divisors (132493119).

231252609 is a wasteful number, since it uses less digits than its factorization.

231252609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22245 (or 22238 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 231252609 is about 15206.9921088952. The cubic root of 231252609 is about 613.8028214197.

The spelling of 231252609 in words is "two hundred thirty-one million, two hundred fifty-two thousand, six hundred nine".