1861094417789 has 4 divisors (see below), whose sum is σ = 1865392557756. Its totient is φ = 1856796277824.

The previous prime is 1861094417783. The next prime is 1861094417851. The reversal of 1861094417789 is 9877144901681.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 332058300025 + 1529036117764 = 576245^2 + 1236542^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1861094417789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1861094417783) 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, 2149069334 + ... + 2149070199.

It is an arithmetic number, because the mean of its divisors is an integer number (466348139439).

Almost surely, 2^{1861094417789} is an apocalyptic number.

It is an amenable number.

1861094417789 is a deficient number, since it is larger than the sum of its proper divisors (4298139967).

1861094417789 is an equidigital number, since it uses as much as digits as its factorization.

1861094417789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4298139966.

The product of its (nonzero) digits is 24385536, while the sum is 65.

The spelling of 1861094417789 in words is "one trillion, eight hundred sixty-one billion, ninety-four million, four hundred seventeen thousand, seven hundred eighty-nine".