1320155 has 4 divisors (see below), whose sum is σ = 1584192. Its totient is φ = 1056120.

The previous prime is 1320149. The next prime is 1320157. The reversal of 1320155 is 5510231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5510231 = 1097 ⋅5023.

It is not a de Polignac number, because 1320155 - 2⁶ = 1320091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1320157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132011 + ... + 132020.

It is an arithmetic number, because the mean of its divisors is an integer number (396048).

2^1320155 is an apocalyptic number.

1320155 is a deficient number, since it is larger than the sum of its proper divisors (264037).

1320155 is an equidigital number, since it uses as much as digits as its factorization.

1320155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264036.

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 1320155 is about 1148.9799824192. The cubic root of 1320155 is about 109.7004245423.

Adding to 1320155 its reverse (5510231), we get a palindrome (6830386).

The spelling of 1320155 in words is "one million, three hundred twenty thousand, one hundred fifty-five".