1859784060121 has 27 divisors (see below), whose sum is σ = 2105676232317. Its totient is φ = 1641723557760.

The previous prime is 1859784060097. The next prime is 1859784060139. The reversal of 1859784060121 is 1210604879581.

The square root of 1859784060121 is 1363739.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 523068865225 + 1336715194896 = 723235^2 + 1156164^2 .

It is not a de Polignac number, because 1859784060121 - 2²⁵ = 1859750505689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1859784060151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 407755681 + ... + 407760241.

Almost surely, 2^{1859784060121} is an apocalyptic number.

1859784060121 is the 1363739-th square number.

1859784060121 is the 681870-th centered octagonal number.

It is an amenable number.

1859784060121 is a deficient number, since it is larger than the sum of its proper divisors (245892172196).

1859784060121 is an frugal number, since it uses more digits than its factorization.

1859784060121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9194 (or 4597 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 52.

The spelling of 1859784060121 in words is "one trillion, eight hundred fifty-nine billion, seven hundred eighty-four million, sixty thousand, one hundred twenty-one".