1155154561 has 16 divisors (see below), whose sum is σ = 1268280000. Its totient is φ = 1043409600.

The previous prime is 1155154549. The next prime is 1155154597. The reversal of 1155154561 is 1654515511.

It is a cyclic number.

It is not a de Polignac number, because 1155154561 - 2⁵ = 1155154529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1155154501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2134951 + ... + 2135491.

It is an arithmetic number, because the mean of its divisors is an integer number (79267500).

Almost surely, 2^1155154561 is an apocalyptic number.

1155154561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1155154561 is a deficient number, since it is larger than the sum of its proper divisors (113125439).

1155154561 is a wasteful number, since it uses less digits than its factorization.

1155154561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1440.

The product of its digits is 15000, while the sum is 34.

The square root of 1155154561 is about 33987.5647994969. The cubic root of 1155154561 is about 1049.2525477128.

The spelling of 1155154561 in words is "one billion, one hundred fifty-five million, one hundred fifty-four thousand, five hundred sixty-one".