1155605551 has 8 divisors (see below), whose sum is σ = 1164732800. Its totient is φ = 1146490200.

The previous prime is 1155605531. The next prime is 1155605579. The reversal of 1155605551 is 1555065511.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1155605551 - 2⁵ = 1155605519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155605531) 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 7 ways as a sum of consecutive naturals, for example, 352960 + ... + 356218.

It is an arithmetic number, because the mean of its divisors is an integer number (145591600).

Almost surely, 2^1155605551 is an apocalyptic number.

1155605551 is a deficient number, since it is larger than the sum of its proper divisors (9127249).

1155605551 is a wasteful number, since it uses less digits than its factorization.

1155605551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5949.

The product of its (nonzero) digits is 18750, while the sum is 34.

The square root of 1155605551 is about 33994.1987844985. The cubic root of 1155605551 is about 1049.3890780248.

The spelling of 1155605551 in words is "one billion, one hundred fifty-five million, six hundred five thousand, five hundred fifty-one".