1899322229281 has 9 divisors (see below), whose sum is σ = 1935909103219. Its totient is φ = 1863414296536.

The previous prime is 1899322229239. The next prime is 1899322229317. The reversal of 1899322229281 is 1829222239981.

The square root of 1899322229281 is 1378159.

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

It can be written as a sum of positive squares in only one way, i.e., 1369215918225 + 530106311056 = 1170135^2 + 728084^2 .

It is not a de Polignac number, because 1899322229281 - 2¹⁷ = 1899322098209 is a prime.

It is a super-2 number, since 2×1899322229281² (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 (1899322220281) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 73029426 + ... + 73055428.

Almost surely, 2^{1899322229281} is an apocalyptic number.

1899322229281 is the 1378159-th square number.

1899322229281 is the 689080-th centered octagonal number.

It is an amenable number.

1899322229281 is a deficient number, since it is larger than the sum of its proper divisors (36586873938).

1899322229281 is an frugal number, since it uses more digits than its factorization.

1899322229281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52112 (or 26056 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 58.

The spelling of 1899322229281 in words is "one trillion, eight hundred ninety-nine billion, three hundred twenty-two million, two hundred twenty-nine thousand, two hundred eighty-one".