1100561553 has 64 divisors (see below), whose sum is σ = 2023096320. Its totient is φ = 575781696.

The previous prime is 1100561533. The next prime is 1100561587. The reversal of 1100561553 is 3551650011.

1100561553 is a `hidden beast` number, since 1 + 100 + 5 + 6 + 1 + 553 = 666.

It is not a de Polignac number, because 1100561553 - 2¹⁴ = 1100545169 is a prime.

It is a super-2 number, since 2×1100561553² = 2422471463883543618, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1100561503) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 310276 + ... + 313802.

It is an arithmetic number, because the mean of its divisors is an integer number (31610880).

Almost surely, 2^1100561553 is an apocalyptic number.

1100561553 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1100561553 is a deficient number, since it is larger than the sum of its proper divisors (922534767).

1100561553 is a wasteful number, since it uses less digits than its factorization.

1100561553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3683 (or 3677 counting only the distinct ones).

The product of its (nonzero) digits is 2250, while the sum is 27.

The square root of 1100561553 is about 33174.7125533892. The cubic root of 1100561553 is about 1032.4557461779.

The spelling of 1100561553 in words is "one billion, one hundred million, five hundred sixty-one thousand, five hundred fifty-three".