311011121 has 2 divisors, whose sum is σ = 311011122. Its totient is φ = 311011120.

The previous prime is 311011097. The next prime is 311011147. The reversal of 311011121 is 121110113.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 267780496 + 43230625 = 16364^2 + 6575^2 .

It is an emirp because it is prime and its reverse (121110113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 311011121 - 2²⁶ = 243902257 is a prime.

It is not a weakly prime, because it can be changed into another prime (311011321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155505560 + 155505561.

It is an arithmetic number, because the mean of its divisors is an integer number (155505561).

Almost surely, 2^311011121 is an apocalyptic number.

It is an amenable number.

311011121 is a deficient number, since it is larger than the sum of its proper divisors (1).

311011121 is an equidigital number, since it uses as much as digits as its factorization.

311011121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6, while the sum is 11.

The square root of 311011121 is about 17635.5073927574. The cubic root of 311011121 is about 677.5249708710.

Adding to 311011121 its reverse (121110113), we get a palindrome (432121234).

The spelling of 311011121 in words is "three hundred eleven million, eleven thousand, one hundred twenty-one".