311232109 has 2 divisors, whose sum is σ = 311232110. Its totient is φ = 311232108.

The previous prime is 311232101. The next prime is 311232127. The reversal of 311232109 is 901232113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 310534884 + 697225 = 17622^2 + 835^2 .

It is a cyclic number.

It is not a de Polignac number, because 311232109 - 2³ = 311232101 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 311232109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311232101) 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, 155616054 + 155616055.

It is an arithmetic number, because the mean of its divisors is an integer number (155616055).

Almost surely, 2^311232109 is an apocalyptic number.

It is an amenable number.

311232109 is a deficient number, since it is larger than the sum of its proper divisors (1).

311232109 is an equidigital number, since it uses as much as digits as its factorization.

311232109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 311232109 is about 17641.7717080797. The cubic root of 311232109 is about 677.6854039767.

The spelling of 311232109 in words is "three hundred eleven million, two hundred thirty-two thousand, one hundred nine".