1121555144 has 16 divisors (see below), whose sum is σ = 2226617100. Its totient is φ = 527790592.

The previous prime is 1121555129. The next prime is 1121555159. The reversal of 1121555144 is 4415551211.

It is an interprime number because it is at equal distance from previous prime (1121555129) and next prime (1121555159).

It can be written as a sum of positive squares in 2 ways, for example, as 1104232900 + 17322244 = 33230^2 + 4162^2 .

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, 4123229 + ... + 4123500.

Almost surely, 2^1121555144 is an apocalyptic number.

It is an amenable number.

1121555144 is a deficient number, since it is larger than the sum of its proper divisors (1105061956).

1121555144 is a wasteful number, since it uses less digits than its factorization.

1121555144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8246752 (or 8246748 counting only the distinct ones).

The product of its digits is 4000, while the sum is 29.

The square root of 1121555144 is about 33489.6274090949. The cubic root of 1121555144 is about 1038.9792573616.

The spelling of 1121555144 in words is "one billion, one hundred twenty-one million, five hundred fifty-five thousand, one hundred forty-four".