311749 has 2 divisors, whose sum is σ = 311750. Its totient is φ = 311748.

The previous prime is 311747. The next prime is 311791. The reversal of 311749 is 947113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 294849 + 16900 = 543^2 + 130^2 .

It is a cyclic number.

It is not a de Polignac number, because 311749 - 2¹ = 311747 is a prime.

Together with 311747, it forms a pair of twin primes.

It is equal to p₂₆₉₃₅ and since 311749 and 26935 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155874 + 155875.

It is an arithmetic number, because the mean of its divisors is an integer number (155875).

2³¹¹⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

311749 is a deficient number, since it is larger than the sum of its proper divisors (1).

311749 is an equidigital number, since it uses as much as digits as its factorization.

311749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 756, while the sum is 25.

The square root of 311749 is about 558.3448755026. The cubic root of 311749 is about 67.8060360733.

The spelling of 311749 in words is "three hundred eleven thousand, seven hundred forty-nine".