231648641 has 4 divisors (see below), whose sum is σ = 264741312. Its totient is φ = 198555972.

The previous prime is 231648587. The next prime is 231648649. The reversal of 231648641 is 146846132.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 231648641 - 2¹⁴ = 231632257 is a prime.

It is a super-2 number, since 2×231648641² = 107322185754293762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231648649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16546325 + ... + 16546338.

It is an arithmetic number, because the mean of its divisors is an integer number (66185328).

Almost surely, 2^231648641 is an apocalyptic number.

It is an amenable number.

231648641 is a deficient number, since it is larger than the sum of its proper divisors (33092671).

231648641 is an equidigital number, since it uses as much as digits as its factorization.

231648641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33092670.

The product of its digits is 27648, while the sum is 35.

The square root of 231648641 is about 15220.0079172121. The cubic root of 231648641 is about 614.1530112351.

The spelling of 231648641 in words is "two hundred thirty-one million, six hundred forty-eight thousand, six hundred forty-one".