245805979 has 2 divisors, whose sum is σ = 245805980. Its totient is φ = 245805978.

The previous prime is 245805929. The next prime is 245806007. The reversal of 245805979 is 979508542.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 245805979 - 2¹⁹ = 245281691 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (245805919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122902989 + 122902990.

It is an arithmetic number, because the mean of its divisors is an integer number (122902990).

Almost surely, 2^245805979 is an apocalyptic number.

245805979 is a deficient number, since it is larger than the sum of its proper divisors (1).

245805979 is an equidigital number, since it uses as much as digits as its factorization.

245805979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 907200, while the sum is 49.

The square root of 245805979 is about 15678.2007577400. The cubic root of 245805979 is about 626.4178830200.

The spelling of 245805979 in words is "two hundred forty-five million, eight hundred five thousand, nine hundred seventy-nine".