245497139 has 2 divisors, whose sum is σ = 245497140. Its totient is φ = 245497138.

The previous prime is 245497129. The next prime is 245497199. The reversal of 245497139 is 931794542.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 245497139 - 2²⁰ = 244448563 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 245497139.

It is not a weakly prime, because it can be changed into another prime (245497129) 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, 122748569 + 122748570.

It is an arithmetic number, because the mean of its divisors is an integer number (122748570).

Almost surely, 2^245497139 is an apocalyptic number.

245497139 is a deficient number, since it is larger than the sum of its proper divisors (1).

245497139 is an equidigital number, since it uses as much as digits as its factorization.

245497139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 44.

The square root of 245497139 is about 15668.3483175477. The cubic root of 245497139 is about 626.1554212997.

The spelling of 245497139 in words is "two hundred forty-five million, four hundred ninety-seven thousand, one hundred thirty-nine".