1871849245 has 24 divisors (see below), whose sum is σ = 2616016824. Its totient is φ = 1282046976.

The previous prime is 1871849173. The next prime is 1871849249. The reversal of 1871849245 is 5429481781.

It can be written as a sum of positive squares in 4 ways, for example, as 184036356 + 1687812889 = 13566^2 + 41083^2 .

It is not a de Polignac number, because 1871849245 - 2²⁷ = 1737631517 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1871849249) 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 23 ways as a sum of consecutive naturals, for example, 229477 + ... + 237493.

It is an arithmetic number, because the mean of its divisors is an integer number (109000701).

Almost surely, 2^1871849245 is an apocalyptic number.

It is an amenable number.

1871849245 is a deficient number, since it is larger than the sum of its proper divisors (744167579).

1871849245 is an equidigital number, since it uses as much as digits as its factorization.

1871849245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8989 (or 8982 counting only the distinct ones).

The product of its digits is 645120, while the sum is 49.

The square root of 1871849245 is about 43264.8731074067. The cubic root of 1871849245 is about 1232.4149450252.

The spelling of 1871849245 in words is "one billion, eight hundred seventy-one million, eight hundred forty-nine thousand, two hundred forty-five".