1889225509081 has 9 divisors (see below), whose sum is σ = 1892677650591. Its totient is φ = 1885779660144.

The previous prime is 1889225509027. The next prime is 1889225509091. The reversal of 1889225509081 is 1809055229881.

The square root of 1889225509081 is 1374491.

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., 1662915990681 + 226309518400 = 1289541^2 + 475720^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1889225509081 is a prime.

It is a super-2 number, since 2×1889225509081² (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 (1889225509091) 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, 1111962370 + ... + 1111964068.

Almost surely, 2^{1889225509081} is an apocalyptic number.

1889225509081 is the 1374491-st square number.

1889225509081 is the 687246-th centered octagonal number.

It is an amenable number.

1889225509081 is a deficient number, since it is larger than the sum of its proper divisors (3452141510).

1889225509081 is an frugal number, since it uses more digits than its factorization.

1889225509081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5016 (or 2508 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 58.

The spelling of 1889225509081 in words is "one trillion, eight hundred eighty-nine billion, two hundred twenty-five million, five hundred nine thousand, eighty-one".