245444813 has 2 divisors, whose sum is σ = 245444814. Its totient is φ = 245444812.

The previous prime is 245444747. The next prime is 245444833. The reversal of 245444813 is 318444542.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130462084 + 114982729 = 11422^2 + 10723^2 .

It is a cyclic number.

It is not a de Polignac number, because 245444813 - 2⁸ = 245444557 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (245444833) 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, 122722406 + 122722407.

It is an arithmetic number, because the mean of its divisors is an integer number (122722407).

Almost surely, 2^245444813 is an apocalyptic number.

It is an amenable number.

245444813 is a deficient number, since it is larger than the sum of its proper divisors (1).

245444813 is an equidigital number, since it uses as much as digits as its factorization.

245444813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 61440, while the sum is 35.

The square root of 245444813 is about 15666.6784290736. The cubic root of 245444813 is about 626.1109312541.

The spelling of 245444813 in words is "two hundred forty-five million, four hundred forty-four thousand, eight hundred thirteen".