201999955 has 8 divisors (see below), whose sum is σ = 242926272. Its totient is φ = 161249088.

The previous prime is 201999929. The next prime is 201999971. The reversal of 201999955 is 559999102.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 201999955 - 2⁵ = 201999923 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201999899 and 201999908.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41314 + ... + 45943.

It is an arithmetic number, because the mean of its divisors is an integer number (30365784).

Almost surely, 2^201999955 is an apocalyptic number.

201999955 is a deficient number, since it is larger than the sum of its proper divisors (40926317).

201999955 is an equidigital number, since it uses as much as digits as its factorization.

201999955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87725.

The product of its (nonzero) digits is 328050, while the sum is 49.

The square root of 201999955 is about 14212.6688204573. The cubic root of 201999955 is about 586.7463872740.

The spelling of 201999955 in words is "two hundred one million, nine hundred ninety-nine thousand, nine hundred fifty-five".