315220481 has 2 divisors, whose sum is σ = 315220482. Its totient is φ = 315220480.

The previous prime is 315220441. The next prime is 315220513. The reversal of 315220481 is 184022513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 180660481 + 134560000 = 13441^2 + 11600^2 .

It is an emirp because it is prime and its reverse (184022513) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-315220481 is a prime.

It is a super-2 number, since 2×315220481² = 198727903283742722, which contains 22 as substring.

It is a Chen prime.

It is equal to p_17031257 and since 315220481 and 17031257 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 315220481.

It is not a weakly prime, because it can be changed into another prime (315220441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157610240 + 157610241.

It is an arithmetic number, because the mean of its divisors is an integer number (157610241).

Almost surely, 2^315220481 is an apocalyptic number.

It is an amenable number.

315220481 is a deficient number, since it is larger than the sum of its proper divisors (1).

315220481 is an equidigital number, since it uses as much as digits as its factorization.

315220481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 315220481 is about 17754.4496112946. The cubic root of 315220481 is about 680.5679230408.

Adding to 315220481 its reverse (184022513), we get a palindrome (499242994).

The spelling of 315220481 in words is "three hundred fifteen million, two hundred twenty thousand, four hundred eighty-one".