201878851 has 16 divisors (see below), whose sum is σ = 214410240. Its totient is φ = 189776160.

The previous prime is 201878849. The next prime is 201878863. The reversal of 201878851 is 158878102.

It is a cyclic number.

It is not a de Polignac number, because 201878851 - 2¹ = 201878849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201878801) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 358296 + ... + 358858.

It is an arithmetic number, because the mean of its divisors is an integer number (13400640).

Almost surely, 2^201878851 is an apocalyptic number.

201878851 is a deficient number, since it is larger than the sum of its proper divisors (12531389).

201878851 is a wasteful number, since it uses less digits than its factorization.

201878851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 906.

The product of its (nonzero) digits is 35840, while the sum is 40.

The square root of 201878851 is about 14208.4077573808. The cubic root of 201878851 is about 586.6291074798.

The spelling of 201878851 in words is "two hundred one million, eight hundred seventy-eight thousand, eight hundred fifty-one".