245105513 has 2 divisors, whose sum is σ = 245105514. Its totient is φ = 245105512.

The previous prime is 245105459. The next prime is 245105521. The reversal of 245105513 is 315501542.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 244985104 + 120409 = 15652^2 + 347^2 .

It is a cyclic number.

It is not a de Polignac number, because 245105513 - 2⁶ = 245105449 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (245105533) 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, 122552756 + 122552757.

It is an arithmetic number, because the mean of its divisors is an integer number (122552757).

Almost surely, 2^245105513 is an apocalyptic number.

It is an amenable number.

245105513 is a deficient number, since it is larger than the sum of its proper divisors (1).

245105513 is an equidigital number, since it uses as much as digits as its factorization.

245105513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 245105513 is about 15655.8459688386. The cubic root of 245105513 is about 625.8222887648.

The spelling of 245105513 in words is "two hundred forty-five million, one hundred five thousand, five hundred thirteen".