1321155 has 48 divisors (see below), whose sum is σ = 2661984. Its totient is φ = 599040.

The previous prime is 1321141. The next prime is 1321157. The reversal of 1321155 is 5511231.

It is not a de Polignac number, because 1321155 - 2⁴ = 1321139 is a prime.

1321155 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1321157) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8337 + ... + 8493.

It is an arithmetic number, because the mean of its divisors is an integer number (55458).

2^1321155 is an apocalyptic number.

1321155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1321155 is an abundant number, since it is smaller than the sum of its proper divisors (1340829).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1321155 is a wasteful number, since it uses less digits than its factorization.

1321155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196 (or 193 counting only the distinct ones).

The product of its digits is 150, while the sum is 18.

The square root of 1321155 is about 1149.4150686327. The cubic root of 1321155 is about 109.7281164263.

Adding to 1321155 its reverse (5511231), we get a palindrome (6832386).

The spelling of 1321155 in words is "one million, three hundred twenty-one thousand, one hundred fifty-five".