311863381 has 2 divisors, whose sum is σ = 311863382. Its totient is φ = 311863380.

The previous prime is 311863367. The next prime is 311863403. The reversal of 311863381 is 183368113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 207619281 + 104244100 = 14409^2 + 10210^2 .

It is a cyclic number.

It is not a de Polignac number, because 311863381 - 2⁹ = 311862869 is a prime.

It is a super-2 number, since 2×311863381² = 194517536817502322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311803381) 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, 155931690 + 155931691.

It is an arithmetic number, because the mean of its divisors is an integer number (155931691).

Almost surely, 2^311863381 is an apocalyptic number.

It is an amenable number.

311863381 is a deficient number, since it is larger than the sum of its proper divisors (1).

311863381 is an equidigital number, since it uses as much as digits as its factorization.

311863381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 34.

The square root of 311863381 is about 17659.6540453090. The cubic root of 311863381 is about 678.1432775865.

The spelling of 311863381 in words is "three hundred eleven million, eight hundred sixty-three thousand, three hundred eighty-one".