201945555 has 40 divisors (see below), whose sum is σ = 413727072. Its totient is φ = 92316672.

The previous prime is 201945553. The next prime is 201945581. The reversal of 201945555 is 555549102.

It is not a de Polignac number, because 201945555 - 2¹ = 201945553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (201945553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 32782 + ... + 38451.

Almost surely, 2^201945555 is an apocalyptic number.

201945555 is an abundant number, since it is smaller than the sum of its proper divisors (211781517).

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

201945555 is an equidigital number, since it uses as much as digits as its factorization.

201945555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71257 (or 71248 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 36.

The square root of 201945555 is about 14210.7549060562. The cubic root of 201945555 is about 586.6937109104.

It can be divided in two parts, 201945 and 555, that added together give a square (202500 = 450²).

The spelling of 201945555 in words is "two hundred one million, nine hundred forty-five thousand, five hundred fifty-five".