245807813 has 2 divisors, whose sum is σ = 245807814. Its totient is φ = 245807812.

The previous prime is 245807803. The next prime is 245807819. The reversal of 245807813 is 318708542.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 244046884 + 1760929 = 15622^2 + 1327^2 .

It is a cyclic number.

It is not a de Polignac number, because 245807813 - 2²⁰ = 244759237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (245807819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122903906 + 122903907.

It is an arithmetic number, because the mean of its divisors is an integer number (122903907).

Almost surely, 2^245807813 is an apocalyptic number.

It is an amenable number.

245807813 is a deficient number, since it is larger than the sum of its proper divisors (1).

245807813 is an equidigital number, since it uses as much as digits as its factorization.

245807813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 53760, while the sum is 38.

The square root of 245807813 is about 15678.2592464852. The cubic root of 245807813 is about 626.4194409527.

The spelling of 245807813 in words is "two hundred forty-five million, eight hundred seven thousand, eight hundred thirteen".