245002561 has 2 divisors, whose sum is σ = 245002562. Its totient is φ = 245002560.

The previous prime is 245002523. The next prime is 245002607. The reversal of 245002561 is 165200542.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128686336 + 116316225 = 11344^2 + 10785^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-245002561 is a prime.

It is not a weakly prime, because it can be changed into another prime (245002061) 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 as a sum of consecutive naturals, namely, 122501280 + 122501281.

It is an arithmetic number, because the mean of its divisors is an integer number (122501281).

Almost surely, 2^245002561 is an apocalyptic number.

It is an amenable number.

245002561 is a deficient number, since it is larger than the sum of its proper divisors (1).

245002561 is an equidigital number, since it uses as much as digits as its factorization.

245002561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 245002561 is about 15652.5576504289. The cubic root of 245002561 is about 625.7346548333.

The spelling of 245002561 in words is "two hundred forty-five million, two thousand, five hundred sixty-one".