313321081 has 2 divisors, whose sum is σ = 313321082. Its totient is φ = 313321080.

The previous prime is 313321079. The next prime is 313321121. The reversal of 313321081 is 180123313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 202208400 + 111112681 = 14220^2 + 10541^2 .

It is a cyclic number.

It is not a de Polignac number, because 313321081 - 2¹ = 313321079 is a prime.

It is a super-2 number, since 2×313321081² = 196340199598017122, which contains 22 as substring.

Together with 313321079, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (313321051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156660540 + 156660541.

It is an arithmetic number, because the mean of its divisors is an integer number (156660541).

Almost surely, 2^313321081 is an apocalyptic number.

It is an amenable number.

313321081 is a deficient number, since it is larger than the sum of its proper divisors (1).

313321081 is an equidigital number, since it uses as much as digits as its factorization.

313321081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 313321081 is about 17700.8779725753. The cubic root of 313321081 is about 679.1982195051.

Adding to 313321081 its reverse (180123313), we get a palindrome (493444394).

The spelling of 313321081 in words is "three hundred thirteen million, three hundred twenty-one thousand, eighty-one".