311121311 has 2 divisors, whose sum is σ = 311121312. Its totient is φ = 311121310.

The previous prime is 311121287. The next prime is 311121319. The reversal of 311121311 is 113121113.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 311121311 - 2¹⁸ = 310859167 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311121319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155560655 + 155560656.

It is an arithmetic number, because the mean of its divisors is an integer number (155560656).

Almost surely, 2^311121311 is an apocalyptic number.

311121311 is a deficient number, since it is larger than the sum of its proper divisors (1).

311121311 is an equidigital number, since it uses as much as digits as its factorization.

311121311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18, while the sum is 14.

The square root of 311121311 is about 17638.6312110662. The cubic root of 311121311 is about 677.6049762218.

Adding to 311121311 its reverse (113121113), we get a palindrome (424242424).

It can be divided in two parts, 31112 and 1311, that added together give a palindrome (32423).

The spelling of 311121311 in words is "three hundred eleven million, one hundred twenty-one thousand, three hundred eleven".