201055555 has 4 divisors (see below), whose sum is σ = 241266672. Its totient is φ = 160844440.

The previous prime is 201055541. The next prime is 201055559. The reversal of 201055555 is 555550102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 555550102 = 2 ⋅277775051.

It is not a de Polignac number, because 201055555 - 2⁵ = 201055523 is a prime.

It is a Duffinian number.

201055555 is a modest number, since divided by 55555 gives 2010 as remainder.

It is not an unprimeable number, because it can be changed into a prime (201055559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20105551 + ... + 20105560.

It is an arithmetic number, because the mean of its divisors is an integer number (60316668).

Almost surely, 2^201055555 is an apocalyptic number.

201055555 is a deficient number, since it is larger than the sum of its proper divisors (40211117).

201055555 is an equidigital number, since it uses as much as digits as its factorization.

201055555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40211116.

The product of its (nonzero) digits is 6250, while the sum is 28.

The square root of 201055555 is about 14179.4060171786. The cubic root of 201055555 is about 585.8305634844.

The spelling of 201055555 in words is "two hundred one million, fifty-five thousand, five hundred fifty-five".