201031111231 has 8 divisors (see below), whose sum is σ = 209999877120. Its totient is φ = 192081368952.

The previous prime is 201031111163. The next prime is 201031111283. The reversal of 201031111231 is 132111130102.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 201031111231 - 2¹⁹ = 201030586943 is a prime.

It is a super-2 number, since 2×201031111231² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201031111291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4734295 + ... + 4776568.

It is an arithmetic number, because the mean of its divisors is an integer number (26249984640).

Almost surely, 2^201031111231 is an apocalyptic number.

201031111231 is a deficient number, since it is larger than the sum of its proper divisors (8968765889).

201031111231 is an equidigital number, since it uses as much as digits as its factorization.

201031111231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9511805.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 201031111231 its reverse (132111130102), we get a palindrome (333142241333).

The spelling of 201031111231 in words is "two hundred one billion, thirty-one million, one hundred eleven thousand, two hundred thirty-one".