1209984481 has 4 divisors (see below), whose sum is σ = 1210901764. Its totient is φ = 1209067200.

The previous prime is 1209984473. The next prime is 1209984493. The reversal of 1209984481 is 1844899021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1169024481 + 40960000 = 34191^2 + 6400^2 .

It is a cyclic number.

It is not a de Polignac number, because 1209984481 - 2³ = 1209984473 is a prime.

It is a super-2 number, since 2×1209984481² = 2928124888521678722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1209984781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 456660 + ... + 459301.

It is an arithmetic number, because the mean of its divisors is an integer number (302725441).

Almost surely, 2^1209984481 is an apocalyptic number.

It is an amenable number.

1209984481 is a deficient number, since it is larger than the sum of its proper divisors (917283).

1209984481 is an equidigital number, since it uses as much as digits as its factorization.

1209984481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 917282.

The product of its (nonzero) digits is 165888, while the sum is 46.

The square root of 1209984481 is about 34784.8311911960. The cubic root of 1209984481 is about 1065.5976810774.

It can be divided in two parts, 12099 and 84481, that added together give a triangular number (96580 = T₄₃₉).

The spelling of 1209984481 in words is "one billion, two hundred nine million, nine hundred eighty-four thousand, four hundred eighty-one".