245566939 has 2 divisors, whose sum is σ = 245566940. Its totient is φ = 245566938.

The previous prime is 245566927. The next prime is 245566943. The reversal of 245566939 is 939665542.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 245566939 - 2¹⁷ = 245435867 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 245566892 and 245566901.

It is not a weakly prime, because it can be changed into another prime (245566949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122783469 + 122783470.

It is an arithmetic number, because the mean of its divisors is an integer number (122783470).

Almost surely, 2^245566939 is an apocalyptic number.

245566939 is a deficient number, since it is larger than the sum of its proper divisors (1).

245566939 is an equidigital number, since it uses as much as digits as its factorization.

245566939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1749600, while the sum is 49.

The square root of 245566939 is about 15670.5755797290. The cubic root of 245566939 is about 626.2147587283.

The spelling of 245566939 in words is "two hundred forty-five million, five hundred sixty-six thousand, nine hundred thirty-nine".