1850561801 has 4 divisors (see below), whose sum is σ = 2018794704. Its totient is φ = 1682328900.

The previous prime is 1850561747. The next prime is 1850561813. The reversal of 1850561801 is 1081650581.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1850561801 - 2¹⁸ = 1850299657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1850561851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84116435 + ... + 84116456.

It is an arithmetic number, because the mean of its divisors is an integer number (504698676).

Almost surely, 2^1850561801 is an apocalyptic number.

1850561801 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1850561801 is a deficient number, since it is larger than the sum of its proper divisors (168232903).

1850561801 is a wasteful number, since it uses less digits than its factorization.

1850561801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168232902.

The product of its (nonzero) digits is 9600, while the sum is 35.

The square root of 1850561801 is about 43018.1566434453. The cubic root of 1850561801 is about 1227.7252780271.

The spelling of 1850561801 in words is "one billion, eight hundred fifty million, five hundred sixty-one thousand, eight hundred one".