311031109 has 2 divisors, whose sum is σ = 311031110. Its totient is φ = 311031108.

The previous prime is 311031107. The next prime is 311031143. The reversal of 311031109 is 901130113.

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., 175960225 + 135070884 = 13265^2 + 11622^2 .

It is a cyclic number.

It is not a de Polignac number, because 311031109 - 2¹ = 311031107 is a prime.

Together with 311031107, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311031103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155515554 + 155515555.

It is an arithmetic number, because the mean of its divisors is an integer number (155515555).

Almost surely, 2^311031109 is an apocalyptic number.

It is an amenable number.

311031109 is a deficient number, since it is larger than the sum of its proper divisors (1).

311031109 is an equidigital number, since it uses as much as digits as its factorization.

311031109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81, while the sum is 19.

The square root of 311031109 is about 17636.0740812688. The cubic root of 311031109 is about 677.5394849062.

The spelling of 311031109 in words is "three hundred eleven million, thirty-one thousand, one hundred nine".