1156555 has 16 divisors (see below), whose sum is σ = 1477440. Its totient is φ = 867328.

The previous prime is 1156553. The next prime is 1156567. The reversal of 1156555 is 5556511.

It is a cyclic number.

It is not a de Polignac number, because 1156555 - 2¹ = 1156553 is a prime.

1156555 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1156553) 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, 10179 + ... + 10291.

It is an arithmetic number, because the mean of its divisors is an integer number (92340).

2^1156555 is an apocalyptic number.

1156555 is a deficient number, since it is larger than the sum of its proper divisors (320885).

1156555 is a wasteful number, since it uses less digits than its factorization.

1156555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230.

The product of its digits is 3750, while the sum is 28.

The square root of 1156555 is about 1075.4324711482. The cubic root of 1156555 is about 104.9676393095.

It can be divided in two parts, 1156 and 555, that added together give a triangular number (1711 = T₅₈).

The spelling of 1156555 in words is "one million, one hundred fifty-six thousand, five hundred fifty-five".