201031101 has 24 divisors (see below), whose sum is σ = 299105144. Its totient is φ = 130014720.

The previous prime is 201031099. The next prime is 201031111. The reversal of 201031101 is 101130102.

It can be written as a sum of positive squares in 4 ways, for example, as 156275001 + 44756100 = 12501^2 + 6690^2 .

It is not a de Polignac number, because 201031101 - 2¹ = 201031099 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201031111) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 151521 + ... + 152841.

Almost surely, 2^201031101 is an apocalyptic number.

It is an amenable number.

201031101 is a deficient number, since it is larger than the sum of its proper divisors (98074043).

201031101 is a wasteful number, since it uses less digits than its factorization.

201031101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1821 (or 1818 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

The square root of 201031101 is about 14178.5436840319. The cubic root of 201031101 is about 585.8068113737.

Adding to 201031101 its reverse (101130102), we get a palindrome (302161203).

Subtracting from 201031101 its reverse (101130102), we obtain a palindrome (99900999).

The spelling of 201031101 in words is "two hundred one million, thirty-one thousand, one hundred one".