1155911 has 8 divisors (see below), whose sum is σ = 1248480. Its totient is φ = 1066912.

The previous prime is 1155907. The next prime is 1155919. The reversal of 1155911 is 1195511.

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 1155911 - 2² = 1155907 is a prime.

It is a super-3 number, since 3×1155911³ = 4633342925271969093, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 200 + ... + 1533.

It is an arithmetic number, because the mean of its divisors is an integer number (156060).

2^1155911 is an apocalyptic number.

1155911 is a deficient number, since it is larger than the sum of its proper divisors (92569).

1155911 is a wasteful number, since it uses less digits than its factorization.

1155911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1785.

The product of its digits is 225, while the sum is 23.

The square root of 1155911 is about 1075.1330150265. The cubic root of 1155911 is about 104.9481527854.

The spelling of 1155911 in words is "one million, one hundred fifty-five thousand, nine hundred eleven".