231220201 has 4 divisors (see below), whose sum is σ = 231299712. Its totient is φ = 231140692.

The previous prime is 231220193. The next prime is 231220217. The reversal of 231220201 is 102022132.

231220201 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 231220201 - 2³ = 231220193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231220001) 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, 35221 + ... + 41266.

It is an arithmetic number, because the mean of its divisors is an integer number (57824928).

Almost surely, 2^231220201 is an apocalyptic number.

It is an amenable number.

231220201 is a deficient number, since it is larger than the sum of its proper divisors (79511).

231220201 is an equidigital number, since it uses as much as digits as its factorization.

231220201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79510.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 231220201 is about 15205.9265090951. The cubic root of 231220201 is about 613.7741470749.

Adding to 231220201 its reverse (102022132), we get a palindrome (333242333).

The spelling of 231220201 in words is "two hundred thirty-one million, two hundred twenty thousand, two hundred one".