313220161 has 2 divisors, whose sum is σ = 313220162. Its totient is φ = 313220160.

The previous prime is 313220147. The next prime is 313220183. The reversal of 313220161 is 161022313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 274531761 + 38688400 = 16569^2 + 6220^2 .

It is an emirp because it is prime and its reverse (161022313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 313220161 - 2⁵ = 313220129 is a prime.

It is not a weakly prime, because it can be changed into another prime (313220191) 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, 156610080 + 156610081.

It is an arithmetic number, because the mean of its divisors is an integer number (156610081).

Almost surely, 2^313220161 is an apocalyptic number.

It is an amenable number.

313220161 is a deficient number, since it is larger than the sum of its proper divisors (1).

313220161 is an equidigital number, since it uses as much as digits as its factorization.

313220161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 313220161 is about 17698.0270369327. The cubic root of 313220161 is about 679.1252889458.

Adding to 313220161 its reverse (161022313), we get a palindrome (474242474).

The spelling of 313220161 in words is "three hundred thirteen million, two hundred twenty thousand, one hundred sixty-one".