1869621410281 has 3 divisors (see below), whose sum is σ = 1869622777623. Its totient is φ = 1869620042940.

The previous prime is 1869621410257. The next prime is 1869621410297. The reversal of 1869621410281 is 1820141269681.

The square root of 1869621410281 is 1367341.

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., 514865086681 + 1354756323600 = 717541^2 + 1163940^2 .

It is not a de Polignac number, because 1869621410281 - 2¹⁷ = 1869621279209 is a prime.

It is a super-2 number, since 2×1869621410281² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1869621410081) 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, 683671 + ... + 2051011.

It is an arithmetic number, because the mean of its divisors is an integer number (623207592541).

Almost surely, 2^{1869621410281} is an apocalyptic number.

1869621410281 is the 1367341-st square number.

1869621410281 is the 683671-st centered octagonal number.

It is an amenable number.

1869621410281 is a deficient number, since it is larger than the sum of its proper divisors (1367342).

1869621410281 is an frugal number, since it uses more digits than its factorization.

1869621410281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2734682 (or 1367341 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 49.

Multiplying 1869621410281 by its sum of digits (49), we get a square (91611449103769 = 9571387²).

The spelling of 1869621410281 in words is "one trillion, eight hundred sixty-nine billion, six hundred twenty-one million, four hundred ten thousand, two hundred eighty-one".