1311131219 has 4 divisors (see below), whose sum is σ = 1311280896. Its totient is φ = 1310981544.

The previous prime is 1311131167. The next prime is 1311131221. The reversal of 1311131219 is 9121311131.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1311131219 is a prime.

It is a super-2 number, since 2×1311131219² = 3438130146872851922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1311131194 and 1311131203.

It is not an unprimeable number, because it can be changed into a prime (1311131719) 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, 60824 + ... + 79509.

It is an arithmetic number, because the mean of its divisors is an integer number (327820224).

Almost surely, 2^1311131219 is an apocalyptic number.

1311131219 is a deficient number, since it is larger than the sum of its proper divisors (149677).

1311131219 is an equidigital number, since it uses as much as digits as its factorization.

1311131219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149676.

The product of its digits is 162, while the sum is 23.

The square root of 1311131219 is about 36209.5459651181. The cubic root of 1311131219 is about 1094.4990428970.

The spelling of 1311131219 in words is "one billion, three hundred eleven million, one hundred thirty-one thousand, two hundred nineteen".