1161555 has 16 divisors (see below), whose sum is σ = 1872384. Its totient is φ = 614880.

The previous prime is 1161553. The next prime is 1161581. The reversal of 1161555 is 5551611.

It is not a de Polignac number, because 1161555 - 2¹ = 1161553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1161551) 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, 2982 + ... + 3348.

It is an arithmetic number, because the mean of its divisors is an integer number (117024).

2^1161555 is an apocalyptic number.

1161555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1161555 is a deficient number, since it is larger than the sum of its proper divisors (710829).

1161555 is a wasteful number, since it uses less digits than its factorization.

1161555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 586.

The product of its digits is 750, while the sum is 24.

The square root of 1161555 is about 1077.7546102894. The cubic root of 1161555 is about 105.1186866538.

The spelling of 1161555 in words is "one million, one hundred sixty-one thousand, five hundred fifty-five".