1861833091201 has 4 divisors (see below), whose sum is σ = 1861844622804. Its totient is φ = 1861821559600.

The previous prime is 1861833091177. The next prime is 1861833091211. The reversal of 1861833091201 is 1021903381681.

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 642241960000 + 1219591131201 = 801400^2 + 1104351^2 .

It is a cyclic number.

It is not a de Polignac number, because 1861833091201 - 2⁵ = 1861833091169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1861833091211) 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, 5520130 + ... + 5847691.

It is an arithmetic number, because the mean of its divisors is an integer number (465461155701).

Almost surely, 2^{1861833091201} is an apocalyptic number.

It is an amenable number.

1861833091201 is a deficient number, since it is larger than the sum of its proper divisors (11531603).

1861833091201 is a wasteful number, since it uses less digits than its factorization.

1861833091201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11531602.

The product of its (nonzero) digits is 62208, while the sum is 43.

The spelling of 1861833091201 in words is "one trillion, eight hundred sixty-one billion, eight hundred thirty-three million, ninety-one thousand, two hundred one".