245490709 has 4 divisors (see below), whose sum is σ = 245735020. Its totient is φ = 245246400.

The previous prime is 245490667. The next prime is 245490719. The reversal of 245490709 is 907094542.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 46539684 + 198951025 = 6822^2 + 14105^2 .

It is a cyclic number.

It is not a de Polignac number, because 245490709 - 2⁹ = 245490197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245490719) 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 in 3 ways as a sum of consecutive naturals, for example, 120642 + ... + 122659.

It is an arithmetic number, because the mean of its divisors is an integer number (61433755).

Almost surely, 2^245490709 is an apocalyptic number.

It is an amenable number.

245490709 is a deficient number, since it is larger than the sum of its proper divisors (244311).

245490709 is a wasteful number, since it uses less digits than its factorization.

245490709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244310.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 245490709 is about 15668.1431254632. The cubic root of 245490709 is about 626.1499545496.

The spelling of 245490709 in words is "two hundred forty-five million, four hundred ninety thousand, seven hundred nine".