19942771227289 has 3 divisors (see below), whose sum is σ = 19942775693023. Its totient is φ = 19942766761556.

The previous prime is 19942771227259. The next prime is 19942771227307. The reversal of 19942771227289 is 98272217724991.

The square root of 19942771227289 is 4465733.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 16371774902025 + 3570996325264 = 4046205^2 + 1889708^2 .

It is not a de Polignac number, because 19942771227289 - 2¹³ = 19942771219097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19942771227209) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2232867 + ... + 6698599.

Almost surely, 2^{19942771227289} is an apocalyptic number.

19942771227289 is the 4465733-rd square number.

19942771227289 is the 2232867-th centered octagonal number.

It is an amenable number.

19942771227289 is a deficient number, since it is larger than the sum of its proper divisors (4465734).

19942771227289 is an frugal number, since it uses more digits than its factorization.

19942771227289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8931466 (or 4465733 counting only the distinct ones).

The product of its digits is 128024064, while the sum is 70.

The spelling of 19942771227289 in words is "nineteen trillion, nine hundred forty-two billion, seven hundred seventy-one million, two hundred twenty-seven thousand, two hundred eighty-nine".