1121321605 has 8 divisors (see below), whose sum is σ = 1347921432. Its totient is φ = 895500288.

The previous prime is 1121321567. The next prime is 1121321611. The reversal of 1121321605 is 5061231211.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 400560196 + 720761409 = 20014^2 + 26847^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1121321605 - 2¹⁵ = 1121288837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 191452 + ... + 197221.

It is an arithmetic number, because the mean of its divisors is an integer number (168490179).

Almost surely, 2^1121321605 is an apocalyptic number.

It is an amenable number.

1121321605 is a deficient number, since it is larger than the sum of its proper divisors (226599827).

1121321605 is an equidigital number, since it uses as much as digits as its factorization.

1121321605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389255.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 1121321605 is about 33486.1404912540. The cubic root of 1121321605 is about 1038.9071375550.

Adding to 1121321605 its reverse (5061231211), we get a palindrome (6182552816).

The spelling of 1121321605 in words is "one billion, one hundred twenty-one million, three hundred twenty-one thousand, six hundred five".