1201155 has 8 divisors (see below), whose sum is σ = 1921872. Its totient is φ = 640608.

The previous prime is 1201153. The next prime is 1201163. The reversal of 1201155 is 5511021.

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

It is not a de Polignac number, because 1201155 - 2¹ = 1201153 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15), and also a Moran number because the ratio is a prime number: 80077 = 1201155 / (1 + 2 + 0 + 1 + 1 + 5 + 5).

It is not an unprimeable number, because it can be changed into a prime (1201153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40024 + ... + 40053.

It is an arithmetic number, because the mean of its divisors is an integer number (240234).

2^1201155 is an apocalyptic number.

1201155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1201155 is a deficient number, since it is larger than the sum of its proper divisors (720717).

1201155 is an equidigital number, since it uses as much as digits as its factorization.

1201155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80085.

The product of its (nonzero) digits is 50, while the sum is 15.

The square root of 1201155 is about 1095.9721711795. The cubic root of 1201155 is about 106.2999396148.

Adding to 1201155 its reverse (5511021), we get a palindrome (6712176).

It can be divided in two parts, 120 and 1155, that added together give a triangular number (1275 = T₅₀).

The spelling of 1201155 in words is "one million, two hundred one thousand, one hundred fifty-five".