1121630553 has 36 divisors (see below), whose sum is σ = 1725134320. Its totient is φ = 700293600.

The previous prime is 1121630537. The next prime is 1121630579. The reversal of 1121630553 is 3550361211.

1121630553 is a `hidden beast` number, since 1 + 1 + 21 + 630 + 5 + 5 + 3 = 666.

It is not a de Polignac number, because 1121630553 - 2⁴ = 1121630537 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1121630053) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1744050 + ... + 1744692.

Almost surely, 2^1121630553 is an apocalyptic number.

It is an amenable number.

1121630553 is a deficient number, since it is larger than the sum of its proper divisors (603503767).

1121630553 is a wasteful number, since it uses less digits than its factorization.

1121630553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870 (or 766 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 1121630553 is about 33490.7532462320. The cubic root of 1121630553 is about 1039.0025424794.

Adding to 1121630553 its reverse (3550361211), we get a palindrome (4671991764).

The spelling of 1121630553 in words is "one billion, one hundred twenty-one million, six hundred thirty thousand, five hundred fifty-three".