1850561849 has 4 divisors (see below), whose sum is σ = 1851005520. Its totient is φ = 1850118180.

The previous prime is 1850561813. The next prime is 1850561851. The reversal of 1850561849 is 9481650581.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9481650581 = 13 ⋅729357737.

It is a cyclic number.

It is not a de Polignac number, because 1850561849 - 2¹⁶ = 1850496313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1850561149) 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 3 ways as a sum of consecutive naturals, for example, 215519 + ... + 223940.

It is an arithmetic number, because the mean of its divisors is an integer number (462751380).

Almost surely, 2^1850561849 is an apocalyptic number.

It is an amenable number.

1850561849 is a deficient number, since it is larger than the sum of its proper divisors (443671).

1850561849 is an equidigital number, since it uses as much as digits as its factorization.

1850561849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443670.

The product of its (nonzero) digits is 345600, while the sum is 47.

The square root of 1850561849 is about 43018.1572013493. The cubic root of 1850561849 is about 1227.7252886420.

The spelling of 1850561849 in words is "one billion, eight hundred fifty million, five hundred sixty-one thousand, eight hundred forty-nine".