311313881 has 2 divisors, whose sum is σ = 311313882. Its totient is φ = 311313880.

The previous prime is 311313857. The next prime is 311313907. The reversal of 311313881 is 188313113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 165894400 + 145419481 = 12880^2 + 12059^2 .

It is a cyclic number.

It is not a de Polignac number, because 311313881 - 2⁶ = 311313817 is a prime.

It is a super-2 number, since 2×311313881² = 193832665006564322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (311313181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155656940 + 155656941.

It is an arithmetic number, because the mean of its divisors is an integer number (155656941).

Almost surely, 2^311313881 is an apocalyptic number.

It is an amenable number.

311313881 is a deficient number, since it is larger than the sum of its proper divisors (1).

311313881 is an equidigital number, since it uses as much as digits as its factorization.

311313881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 29.

The square root of 311313881 is about 17644.0891235564. The cubic root of 311313881 is about 677.7447496512.

Adding to 311313881 its reverse (188313113), we get a palindrome (499626994).

The spelling of 311313881 in words is "three hundred eleven million, three hundred thirteen thousand, eight hundred eighty-one".