245441561 has 2 divisors, whose sum is σ = 245441562. Its totient is φ = 245441560.

The previous prime is 245441531. The next prime is 245441627. The reversal of 245441561 is 165144542.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 243953161 + 1488400 = 15619^2 + 1220^2 .

It is a cyclic number.

It is not a de Polignac number, because 245441561 - 2²² = 241247257 is a prime.

It is a super-2 number, since 2×245441561² = 120483119732233442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (245441531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122720780 + 122720781.

It is an arithmetic number, because the mean of its divisors is an integer number (122720781).

Almost surely, 2^245441561 is an apocalyptic number.

It is an amenable number.

245441561 is a deficient number, since it is larger than the sum of its proper divisors (1).

245441561 is an equidigital number, since it uses as much as digits as its factorization.

245441561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19200, while the sum is 32.

The square root of 245441561 is about 15666.5746415737. The cubic root of 245441561 is about 626.1081660409.

The spelling of 245441561 in words is "two hundred forty-five million, four hundred forty-one thousand, five hundred sixty-one".