1331213311 has 4 divisors (see below), whose sum is σ = 1332028152. Its totient is φ = 1330398472.

The previous prime is 1331213291. The next prime is 1331213333. The reversal of 1331213311 is 1133121331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1133121331 = 31 ⋅36552301.

It is a cyclic number.

It is not a de Polignac number, because 1331213311 - 2⁷ = 1331213183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331213341) 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, 404965 + ... + 408238.

It is an arithmetic number, because the mean of its divisors is an integer number (333007038).

Almost surely, 2^1331213311 is an apocalyptic number.

1331213311 is a deficient number, since it is larger than the sum of its proper divisors (814841).

1331213311 is an equidigital number, since it uses as much as digits as its factorization.

1331213311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 814840.

The product of its digits is 162, while the sum is 19.

The square root of 1331213311 is about 36485.7960170804. The cubic root of 1331213311 is about 1100.0587602219.

Adding to 1331213311 its reverse (1133121331), we get a palindrome (2464334642).

The spelling of 1331213311 in words is "one billion, three hundred thirty-one million, two hundred thirteen thousand, three hundred eleven".