311130389 has 2 divisors, whose sum is σ = 311130390. Its totient is φ = 311130388.

The previous prime is 311130343. The next prime is 311130419. The reversal of 311130389 is 983031113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 273406225 + 37724164 = 16535^2 + 6142^2 .

It is an emirp because it is prime and its reverse (983031113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 311130389 - 2⁸ = 311130133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311130319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155565194 + 155565195.

It is an arithmetic number, because the mean of its divisors is an integer number (155565195).

Almost surely, 2^311130389 is an apocalyptic number.

It is an amenable number.

311130389 is a deficient number, since it is larger than the sum of its proper divisors (1).

311130389 is an equidigital number, since it uses as much as digits as its factorization.

311130389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 311130389 is about 17638.8885420822. Note that the first 3 decimals coincide. The cubic root of 311130389 is about 677.6115666180.

The spelling of 311130389 in words is "three hundred eleven million, one hundred thirty thousand, three hundred eighty-nine".