1894721967121 has 9 divisors (see below), whose sum is σ = 1935959031849. Its totient is φ = 1854345415284.

The previous prime is 1894721967101. The next prime is 1894721967161. The reversal of 1894721967121 is 1217691274981.

The square root of 1894721967121 is 1376489.

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

It is not a de Polignac number, because 1894721967121 - 2¹³ = 1894721958929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1894721967101) 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 8 ways as a sum of consecutive naturals, for example, 64680340 + ... + 64709626.

Almost surely, 2^{1894721967121} is an apocalyptic number.

1894721967121 is the 1376489-th square number.

1894721967121 is the 688245-th centered octagonal number.

It is an amenable number.

1894721967121 is a deficient number, since it is larger than the sum of its proper divisors (41237064728).

1894721967121 is an frugal number, since it uses more digits than its factorization.

1894721967121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58668 (or 29334 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 58.

The spelling of 1894721967121 in words is "one trillion, eight hundred ninety-four billion, seven hundred twenty-one million, nine hundred sixty-seven thousand, one hundred twenty-one".