1801201851 has 12 divisors (see below), whose sum is σ = 2610998520. Its totient is φ = 1196526240.

The previous prime is 1801201837. The next prime is 1801201879. The reversal of 1801201851 is 1581021081.

It is not a de Polignac number, because 1801201851 - 2¹⁰ = 1801200827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1801201951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 353581 + ... + 358638.

It is an arithmetic number, because the mean of its divisors is an integer number (217583210).

Almost surely, 2^1801201851 is an apocalyptic number.

1801201851 is a deficient number, since it is larger than the sum of its proper divisors (809796669).

1801201851 is a wasteful number, since it uses less digits than its factorization.

1801201851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712506 (or 712503 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 27.

The square root of 1801201851 is about 42440.5684575501. The cubic root of 1801201851 is about 1216.7110759379.

The spelling of 1801201851 in words is "one billion, eight hundred one million, two hundred one thousand, eight hundred fifty-one".