1155553 has 4 divisors (see below), whose sum is σ = 1320640. Its totient is φ = 990468.

The previous prime is 1155529. The next prime is 1155569. The reversal of 1155553 is 3555511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3555511 = 983 ⋅3617.

It is a cyclic number.

It is not a de Polignac number, because 1155553 - 2¹⁷ = 1024481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1155053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82533 + ... + 82546.

It is an arithmetic number, because the mean of its divisors is an integer number (330160).

2^1155553 is an apocalyptic number.

It is an amenable number.

1155553 is a deficient number, since it is larger than the sum of its proper divisors (165087).

1155553 is an equidigital number, since it uses as much as digits as its factorization.

1155553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165086.

The product of its digits is 1875, while the sum is 25.

The square root of 1155553 is about 1074.9665111063. The cubic root of 1155553 is about 104.9373170843.

The spelling of 1155553 in words is "one million, one hundred fifty-five thousand, five hundred fifty-three".