1131213 has 4 divisors (see below), whose sum is σ = 1508288. Its totient is φ = 754140.

The previous prime is 1131191. The next prime is 1131217. The reversal of 1131213 is 3121311.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1131213 - 2⁵ = 1131181 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

1131213 is a lucky number.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131217) 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, 188533 + ... + 188538.

It is an arithmetic number, because the mean of its divisors is an integer number (377072).

2^1131213 is an apocalyptic number.

It is an amenable number.

1131213 is a deficient number, since it is larger than the sum of its proper divisors (377075).

1131213 is an equidigital number, since it uses as much as digits as its factorization.

1131213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377074.

The product of its digits is 18, while the sum is 12.

The square root of 1131213 is about 1063.5849754486. The cubic root of 1131213 is about 104.1952999330.

Adding to 1131213 its reverse (3121311), we get a palindrome (4252524).

It can be divided in two parts, 11312 and 13, that added together give a triangular number (11325 = T₁₅₀).

The spelling of 1131213 in words is "one million, one hundred thirty-one thousand, two hundred thirteen".