201755551 has 4 divisors (see below), whose sum is σ = 202105792. Its totient is φ = 201405312.

The previous prime is 201755549. The next prime is 201755573. The reversal of 201755551 is 155557102.

201755551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 201755551 - 2¹ = 201755549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201755501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 174255 + ... + 175408.

It is an arithmetic number, because the mean of its divisors is an integer number (50526448).

Almost surely, 2^201755551 is an apocalyptic number.

201755551 is a deficient number, since it is larger than the sum of its proper divisors (350241).

201755551 is an equidigital number, since it uses as much as digits as its factorization.

201755551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350240.

The product of its (nonzero) digits is 8750, while the sum is 31.

The square root of 201755551 is about 14204.0681144523. The cubic root of 201755551 is about 586.5096528344.

It can be divided in two parts, 20 and 1755551, that added together give a palindrome (1755571).

The spelling of 201755551 in words is "two hundred one million, seven hundred fifty-five thousand, five hundred fifty-one".