1191555 has 12 divisors (see below), whose sum is σ = 2065440. Its totient is φ = 635472.

The previous prime is 1191551. The next prime is 1191559. The reversal of 1191555 is 5551911.

It is an interprime number because it is at equal distance from previous prime (1191551) and next prime (1191559).

It is not a de Polignac number, because 1191555 - 2² = 1191551 is a prime.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (1191551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13195 + ... + 13284.

It is an arithmetic number, because the mean of its divisors is an integer number (172120).

2^1191555 is an apocalyptic number.

1191555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1191555 is a deficient number, since it is larger than the sum of its proper divisors (873885).

1191555 is a wasteful number, since it uses less digits than its factorization.

1191555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26490 (or 26487 counting only the distinct ones).

The product of its digits is 1125, while the sum is 27.

The square root of 1191555 is about 1091.5837118609. The cubic root of 1191555 is about 106.0159878578.

The spelling of 1191555 in words is "one million, one hundred ninety-one thousand, five hundred fifty-five".