1809266481 has 12 divisors (see below), whose sum is σ = 2850965520. Its totient is φ = 1096525080.

The previous prime is 1809266479. The next prime is 1809266509. The reversal of 1809266481 is 1846629081.

1809266481 is a `hidden beast` number, since 1 + 80 + 92 + 6 + 6 + 481 = 666.

It is not a de Polignac number, because 1809266481 - 2¹ = 1809266479 is a prime.

It is a super-2 number, since 2×1809266481² = 6546890398540246722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1809266461) 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 11 ways as a sum of consecutive naturals, for example, 9137611 + ... + 9137808.

It is an arithmetic number, because the mean of its divisors is an integer number (237580460).

Almost surely, 2^1809266481 is an apocalyptic number.

1809266481 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1809266481 is a deficient number, since it is larger than the sum of its proper divisors (1041699039).

1809266481 is a wasteful number, since it uses less digits than its factorization.

1809266481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18275436 (or 18275433 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The square root of 1809266481 is about 42535.4732076652. The cubic root of 1809266481 is about 1218.5242572348.

The spelling of 1809266481 in words is "one billion, eight hundred nine million, two hundred sixty-six thousand, four hundred eighty-one".