1121605156 has 12 divisors (see below), whose sum is σ = 2243210368. Its totient is φ = 480687912.

The previous prime is 1121605103. The next prime is 1121605171. The reversal of 1121605156 is 6515061211.

It is a happy number.

1121605156 is an admirable number.

It is a Harshad number since it is a multiple of its sum of digits (28), and also a Moran number because the ratio is a prime number: 40057327 = 1121605156 / (1 + 1 + 2 + 1 + 6 + 0 + 5 + 1 + 5 + 6).

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 20028636 + ... + 20028691.

Almost surely, 2^1121605156 is an apocalyptic number.

It is an amenable number.

1121605156 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1121605156 is a wasteful number, since it uses less digits than its factorization.

1121605156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40057338 (or 40057336 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 28.

The square root of 1121605156 is about 33490.3740797263. The cubic root of 1121605156 is about 1038.9947004003.

Adding to 1121605156 its reverse (6515061211), we get a palindrome (7636666367).

The spelling of 1121605156 in words is "one billion, one hundred twenty-one million, six hundred five thousand, one hundred fifty-six".