1919228481 has 27 divisors (see below), whose sum is σ = 2948315331. Its totient is φ = 1202819904.

The previous prime is 1919228459. The next prime is 1919228483. The reversal of 1919228481 is 1848229191.

The square root of 1919228481 is 43809.

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., 1494209025 + 425019456 = 38655^2 + 20616^2 .

It is not a de Polignac number, because 1919228481 - 2²⁷ = 1785010753 is a prime.

It is a super-2 number, since 2×1919228481² = 7366875924563134722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1919228483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 2233830 + ... + 2234688.

Almost surely, 2^1919228481 is an apocalyptic number.

1919228481 is the 43809-th square number.

1919228481 is the 21905-th centered octagonal number.

It is an amenable number.

1919228481 is a deficient number, since it is larger than the sum of its proper divisors (1029086850).

1919228481 is an frugal number, since it uses more digits than its factorization.

1919228481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1758 (or 879 counting only the distinct ones).

The product of its digits is 82944, while the sum is 45.

The cubic root of 1919228481 is about 1242.7265016808.

Multiplying 1919228481 by its product of digits (82944), we get a square (159188487128064 = 12616992²).

It can be divided in two parts, 1919 and 228481, that added together give a square (230400 = 480²).

The spelling of 1919228481 in words is "one billion, nine hundred nineteen million, two hundred twenty-eight thousand, four hundred eighty-one".