245420317 has 2 divisors, whose sum is σ = 245420318. Its totient is φ = 245420316.

The previous prime is 245420303. The next prime is 245420339. The reversal of 245420317 is 713024542.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 226532601 + 18887716 = 15051^2 + 4346^2 .

It is a cyclic number.

It is not a de Polignac number, because 245420317 - 2²³ = 237031709 is a prime.

It is a super-2 number, since 2×245420317² = 120462263992760978, which contains 22 as substring.

It is a Chen prime.

It is equal to p_13442446 and since 245420317 and 13442446 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 (245420377) 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, 122710158 + 122710159.

It is an arithmetic number, because the mean of its divisors is an integer number (122710159).

Almost surely, 2^245420317 is an apocalyptic number.

It is an amenable number.

245420317 is a deficient number, since it is larger than the sum of its proper divisors (1).

245420317 is an equidigital number, since it uses as much as digits as its factorization.

245420317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 245420317 is about 15665.8966229195. The cubic root of 245420317 is about 626.0901014208.

Adding to 245420317 its reverse (713024542), we get a palindrome (958444859).

It can be divided in two parts, 2454203 and 17, that added together give a triangular number (2454220 = T₂₂₁₅).

The spelling of 245420317 in words is "two hundred forty-five million, four hundred twenty thousand, three hundred seventeen".