1311155 has 4 divisors (see below), whose sum is σ = 1573392. Its totient is φ = 1048920.

The previous prime is 1311143. The next prime is 1311173. The reversal of 1311155 is 5511131.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1311155 - 2⁸ = 1310899 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131111 + ... + 131120.

It is an arithmetic number, because the mean of its divisors is an integer number (393348).

2^1311155 is an apocalyptic number.

1311155 is a deficient number, since it is larger than the sum of its proper divisors (262237).

1311155 is an equidigital number, since it uses as much as digits as its factorization.

1311155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262236.

The product of its digits is 75, while the sum is 17.

The square root of 1311155 is about 1145.0567671517. The cubic root of 1311155 is about 109.4505660115.

Adding to 1311155 its reverse (5511131), we get a palindrome (6822286).

The spelling of 1311155 in words is "one million, three hundred eleven thousand, one hundred fifty-five".