201020231 has 4 divisors (see below), whose sum is σ = 201545472. Its totient is φ = 200494992.

The previous prime is 201020201. The next prime is 201020233. The reversal of 201020231 is 132020102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 201020231 - 2¹⁰ = 201019207 is a prime.

It is a super-2 number, since 2×201020231² = 80818266542586722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201020233) 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, 262046 + ... + 262811.

It is an arithmetic number, because the mean of its divisors is an integer number (50386368).

Almost surely, 2^201020231 is an apocalyptic number.

201020231 is a deficient number, since it is larger than the sum of its proper divisors (525241).

201020231 is an equidigital number, since it uses as much as digits as its factorization.

201020231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525240.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 201020231 is about 14178.1603531629. The cubic root of 201020231 is about 585.7962527507.

Adding to 201020231 its reverse (132020102), we get a palindrome (333040333).

The spelling of 201020231 in words is "two hundred one million, twenty thousand, two hundred thirty-one".