311388349 has 2 divisors, whose sum is σ = 311388350. Its totient is φ = 311388348.

The previous prime is 311388331. The next prime is 311388377. The reversal of 311388349 is 943883113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 233631225 + 77757124 = 15285^2 + 8818^2 .

It is a cyclic number.

It is not a de Polignac number, because 311388349 - 2¹¹ = 311386301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311383349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155694174 + 155694175.

It is an arithmetic number, because the mean of its divisors is an integer number (155694175).

Almost surely, 2^311388349 is an apocalyptic number.

It is an amenable number.

311388349 is a deficient number, since it is larger than the sum of its proper divisors (1).

311388349 is an equidigital number, since it uses as much as digits as its factorization.

311388349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 40.

The square root of 311388349 is about 17646.1992791649. The cubic root of 311388349 is about 677.7987854388.

The spelling of 311388349 in words is "three hundred eleven million, three hundred eighty-eight thousand, three hundred forty-nine".