1890545250841 has 9 divisors (see below), whose sum is σ = 2047177822431. Its totient is φ = 1745102193432.

The previous prime is 1890545250817. The next prime is 1890545250901. The reversal of 1890545250841 is 1480525450981.

The square root of 1890545250841 is 1374971.

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., 279666457225 + 1610878793616 = 528835^2 + 1269204^2 .

It is not a de Polignac number, because 1890545250841 - 2²¹ = 1890543153689 is a prime.

It is a super-2 number, since 2×1890545250841² (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 (1890545250241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 17821740 + ... + 17927506.

Almost surely, 2^{1890545250841} is an apocalyptic number.

1890545250841 is the 1374971-st square number.

1890545250841 is the 687486-th centered octagonal number.

It is an amenable number.

1890545250841 is a deficient number, since it is larger than the sum of its proper divisors (156632571590).

1890545250841 is an frugal number, since it uses more digits than its factorization.

1890545250841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211560 (or 105780 counting only the distinct ones).

The product of its (nonzero) digits is 2304000, while the sum is 52.

The spelling of 1890545250841 in words is "one trillion, eight hundred ninety billion, five hundred forty-five million, two hundred fifty thousand, eight hundred forty-one".