1155505445 has 4 divisors (see below), whose sum is σ = 1386606540. Its totient is φ = 924404352.

The previous prime is 1155505411. The next prime is 1155505451. The reversal of 1155505445 is 5445055511.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 876515236 + 278990209 = 29606^2 + 16703^2 .

It is a cyclic number.

It is not a de Polignac number, because 1155505445 - 2⁶ = 1155505381 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115550540 + ... + 115550549.

It is an arithmetic number, because the mean of its divisors is an integer number (346651635).

Almost surely, 2^1155505445 is an apocalyptic number.

It is an amenable number.

1155505445 is a deficient number, since it is larger than the sum of its proper divisors (231101095).

1155505445 is an equidigital number, since it uses as much as digits as its factorization.

1155505445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231101094.

The product of its (nonzero) digits is 50000, while the sum is 35.

The square root of 1155505445 is about 33992.7263543247. The cubic root of 1155505445 is about 1049.3587755350.

The spelling of 1155505445 in words is "one billion, one hundred fifty-five million, five hundred five thousand, four hundred forty-five".