311093381 has 2 divisors, whose sum is σ = 311093382. Its totient is φ = 311093380.

The previous prime is 311093333. The next prime is 311093383. The reversal of 311093381 is 183390113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 223502500 + 87590881 = 14950^2 + 9359^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311093381 is a prime.

It is a super-2 number, since 2×311093381² = 193558183404022322, which contains 22 as substring.

Together with 311093383, 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 (311093383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155546690 + 155546691.

It is an arithmetic number, because the mean of its divisors is an integer number (155546691).

Almost surely, 2^311093381 is an apocalyptic number.

It is an amenable number.

311093381 is a deficient number, since it is larger than the sum of its proper divisors (1).

311093381 is an equidigital number, since it uses as much as digits as its factorization.

311093381 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 311093381 is about 17637.8394651953. The cubic root of 311093381 is about 677.5846989508.

The spelling of 311093381 in words is "three hundred eleven million, ninety-three thousand, three hundred eighty-one".