1155647121 has 8 divisors (see below), whose sum is σ = 1607856960. Its totient is φ = 736934352.

The previous prime is 1155647099. The next prime is 1155647221. The reversal of 1155647121 is 1217465511.

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

It is not a de Polignac number, because 1155647121 - 2¹³ = 1155638929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1155647221) 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, 8374186 + ... + 8374323.

It is an arithmetic number, because the mean of its divisors is an integer number (200982120).

Almost surely, 2^1155647121 is an apocalyptic number.

It is an amenable number.

1155647121 is a deficient number, since it is larger than the sum of its proper divisors (452209839).

1155647121 is a wasteful number, since it uses less digits than its factorization.

1155647121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16748535.

The product of its digits is 8400, while the sum is 33.

The square root of 1155647121 is about 33994.8102068536. The cubic root of 1155647121 is about 1049.4016609172.

The spelling of 1155647121 in words is "one billion, one hundred fifty-five million, six hundred forty-seven thousand, one hundred twenty-one".