311012081 has 2 divisors, whose sum is σ = 311012082. Its totient is φ = 311012080.

The previous prime is 311012071. The next prime is 311012087. The reversal of 311012081 is 180210113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 276390625 + 34621456 = 16625^2 + 5884^2 .

It is an emirp because it is prime and its reverse (180210113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 311012081 - 2⁶ = 311012017 is a prime.

It is a super-2 number, since 2×311012081² = 193457029055901122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (311012087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155506040 + 155506041.

It is an arithmetic number, because the mean of its divisors is an integer number (155506041).

Almost surely, 2^311012081 is an apocalyptic number.

It is an amenable number.

311012081 is a deficient number, since it is larger than the sum of its proper divisors (1).

311012081 is an equidigital number, since it uses as much as digits as its factorization.

311012081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 17.

The square root of 311012081 is about 17635.5346105526. The cubic root of 311012081 is about 677.5256679772.

Adding to 311012081 its reverse (180210113), we get a palindrome (491222194).

The spelling of 311012081 in words is "three hundred eleven million, twelve thousand, eighty-one".