201031530 has 128 divisors (see below), whose sum is σ = 568995840. Its totient is φ = 44513280.

The previous prime is 201031517. The next prime is 201031541. The reversal of 201031530 is 35130102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1446201 + ... + 1446339.

It is an arithmetic number, because the mean of its divisors is an integer number (4445280).

Almost surely, 2^201031530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 201031530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (284497920).

201031530 is an abundant number, since it is smaller than the sum of its proper divisors (367964310).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201031530 is a wasteful number, since it uses less digits than its factorization.

201031530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324.

The product of its (nonzero) digits is 90, while the sum is 15.

The square root of 201031530 is about 14178.5588125169. The cubic root of 201031530 is about 585.8072280769.

Adding to 201031530 its reverse (35130102), we get a palindrome (236161632).

The spelling of 201031530 in words is "two hundred one million, thirty-one thousand, five hundred thirty".