1155555545 has 4 divisors (see below), whose sum is σ = 1386666660. Its totient is φ = 924444432.

The previous prime is 1155555529. The next prime is 1155555553. The reversal of 1155555545 is 5455555511.

It is a happy number.

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 608510224 + 547045321 = 24668^2 + 23389^2 .

It is a cyclic number.

It is not a de Polignac number, because 1155555545 - 2⁴ = 1155555529 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115555550 + ... + 115555559.

It is an arithmetic number, because the mean of its divisors is an integer number (346666665).

Almost surely, 2^1155555545 is an apocalyptic number.

It is an amenable number.

1155555545 is a deficient number, since it is larger than the sum of its proper divisors (231111115).

1155555545 is an equidigital number, since it uses as much as digits as its factorization.

1155555545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231111114.

The product of its digits is 312500, while the sum is 41.

The square root of 1155555545 is about 33993.4632686933. The cubic root of 1155555545 is about 1049.3739412258.

The spelling of 1155555545 in words is "one billion, one hundred fifty-five million, five hundred fifty-five thousand, five hundred forty-five".