231650921 has 12 divisors (see below), whose sum is σ = 239659008. Its totient is φ = 223795152.

The previous prime is 231650899. The next prime is 231650953. The reversal of 231650921 is 129056132.

It is not a de Polignac number, because 231650921 - 2¹⁸ = 231388777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231650981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1175795 + ... + 1175991.

It is an arithmetic number, because the mean of its divisors is an integer number (19971584).

Almost surely, 2^231650921 is an apocalyptic number.

It is an amenable number.

231650921 is a deficient number, since it is larger than the sum of its proper divisors (8008087).

231650921 is an equidigital number, since it uses as much as digits as its factorization.

231650921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568 (or 371 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 231650921 is about 15220.0828184343. The cubic root of 231650921 is about 614.1550261606.

The spelling of 231650921 in words is "two hundred thirty-one million, six hundred fifty thousand, nine hundred twenty-one".