201155505 has 16 divisors (see below), whose sum is σ = 329334720. Its totient is φ = 104787648.

The previous prime is 201155503. The next prime is 201155519. The reversal of 201155505 is 505551102.

It is not a de Polignac number, because 201155505 - 2¹ = 201155503 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (201155501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155290 + ... + 156579.

It is an arithmetic number, because the mean of its divisors is an integer number (20583420).

Almost surely, 2^201155505 is an apocalyptic number.

It is an amenable number.

201155505 is a deficient number, since it is larger than the sum of its proper divisors (128179215).

201155505 is a wasteful number, since it uses less digits than its factorization.

201155505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311920.

The product of its (nonzero) digits is 1250, while the sum is 24.

The square root of 201155505 is about 14182.9300569382. The cubic root of 201155505 is about 585.9276246585.

The spelling of 201155505 in words is "two hundred one million, one hundred fifty-five thousand, five hundred five".