13811190428281 has 3 divisors (see below), whose sum is σ = 13811194144623. Its totient is φ = 13811186711940.

The previous prime is 13811190428267. The next prime is 13811190428309. The reversal of 13811190428281 is 18282409111831.

The square root of 13811190428281 is 3716341.

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., 12011138872681 + 1800051555600 = 3465709^2 + 1341660^2 .

It is not a de Polignac number, because 13811190428281 - 2²⁹ = 13810653557369 is a prime.

It is a super-2 number, since 2×13811190428281² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13811190428251) 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, 1858171 + ... + 5574511.

It is an arithmetic number, because the mean of its divisors is an integer number (4603731381541).

Almost surely, 2^{13811190428281} is an apocalyptic number.

13811190428281 is the 3716341-st square number.

13811190428281 is the 1858171-st centered octagonal number.

It is an amenable number.

13811190428281 is a deficient number, since it is larger than the sum of its proper divisors (3716342).

13811190428281 is an frugal number, since it uses more digits than its factorization.

13811190428281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7432682 (or 3716341 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 49.

Multiplying 13811190428281 by its sum of digits (49), we get a square (676748330985769 = 26014387²).

The spelling of 13811190428281 in words is "thirteen trillion, eight hundred eleven billion, one hundred ninety million, four hundred twenty-eight thousand, two hundred eighty-one".