201011550 has 48 divisors (see below), whose sum is σ = 504848640. Its totient is φ = 52921440.

The previous prime is 201011543. The next prime is 201011581. The reversal of 201011550 is 55110102.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3369 + ... + 20331.

It is an arithmetic number, because the mean of its divisors is an integer number (10517680).

Almost surely, 2^201011550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 201011550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (252424320).

201011550 is an abundant number, since it is smaller than the sum of its proper divisors (303837090).

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

201011550 is a wasteful number, since it uses less digits than its factorization.

201011550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17057 (or 17052 counting only the distinct ones).

The product of its (nonzero) digits is 50, while the sum is 15.

The square root of 201011550 is about 14177.8542099995. The cubic root of 201011550 is about 585.7878201492.

Adding to 201011550 its reverse (55110102), we get a palindrome (256121652).

The spelling of 201011550 in words is "two hundred one million, eleven thousand, five hundred fifty".