1213331311 has 2 divisors, whose sum is σ = 1213331312. Its totient is φ = 1213331310.

The previous prime is 1213331303. The next prime is 1213331323. The reversal of 1213331311 is 1131333121.

It is a weak prime.

It is an emirp because it is prime and its reverse (1131333121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1213331311 - 2³ = 1213331303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213331381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606665655 + 606665656.

It is an arithmetic number, because the mean of its divisors is an integer number (606665656).

Almost surely, 2^1213331311 is an apocalyptic number.

1213331311 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213331311 is an equidigital number, since it uses as much as digits as its factorization.

1213331311 is an evil number, because the sum of its binary digits is even.

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

The square root of 1213331311 is about 34832.9055779158. The cubic root of 1213331311 is about 1066.5792614686.

Adding to 1213331311 its reverse (1131333121), we get a palindrome (2344664432).

The spelling of 1213331311 in words is "one billion, two hundred thirteen million, three hundred thirty-one thousand, three hundred eleven".