201243100 has 72 divisors (see below), whose sum is σ = 463720320. Its totient is φ = 75641280.

The previous prime is 201243089. The next prime is 201243101. The reversal of 201243100 is 1342102.

It is a super-2 number, since 2×201243100² = 80997570595220000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201243101) 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, 134959 + ... + 136441.

It is an arithmetic number, because the mean of its divisors is an integer number (6440560).

Almost surely, 2^201243100 is an apocalyptic number.

201243100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 201243100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (231860160).

201243100 is an abundant number, since it is smaller than the sum of its proper divisors (262477220).

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

201243100 is a wasteful number, since it uses less digits than its factorization.

201243100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1579 (or 1572 counting only the distinct ones).

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

The square root of 201243100 is about 14186.0177639815. The cubic root of 201243100 is about 586.0126614930.

Adding to 201243100 its reverse (1342102), we get a palindrome (202585202).

The spelling of 201243100 in words is "two hundred one million, two hundred forty-three thousand, one hundred".