311811121 has 2 divisors, whose sum is σ = 311811122. Its totient is φ = 311811120.

The previous prime is 311811083. The next prime is 311811187. The reversal of 311811121 is 121118113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 235929600 + 75881521 = 15360^2 + 8711^2 .

It is a cyclic number.

It is not a de Polignac number, because 311811121 - 2²¹ = 309713969 is a prime.

It is not a weakly prime, because it can be changed into another prime (311812121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155905560 + 155905561.

It is an arithmetic number, because the mean of its divisors is an integer number (155905561).

Almost surely, 2^311811121 is an apocalyptic number.

It is an amenable number.

311811121 is a deficient number, since it is larger than the sum of its proper divisors (1).

311811121 is an equidigital number, since it uses as much as digits as its factorization.

311811121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48, while the sum is 19.

The square root of 311811121 is about 17658.1743393817. The cubic root of 311811121 is about 678.1053958840.

Adding to 311811121 its reverse (121118113), we get a palindrome (432929234).

The spelling of 311811121 in words is "three hundred eleven million, eight hundred eleven thousand, one hundred twenty-one".