245056781 has 2 divisors, whose sum is σ = 245056782. Its totient is φ = 245056780.

The previous prime is 245056769. The next prime is 245056811. The reversal of 245056781 is 187650542.

245056781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 203518756 + 41538025 = 14266^2 + 6445^2 .

It is a cyclic number.

It is not a de Polignac number, because 245056781 - 2¹⁸ = 244794637 is a prime.

It is a super-2 number, since 2×245056781² = 120105651828163922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (245056741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122528390 + 122528391.

It is an arithmetic number, because the mean of its divisors is an integer number (122528391).

Almost surely, 2^245056781 is an apocalyptic number.

It is an amenable number.

245056781 is a deficient number, since it is larger than the sum of its proper divisors (1).

245056781 is an equidigital number, since it uses as much as digits as its factorization.

245056781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 67200, while the sum is 38.

The square root of 245056781 is about 15654.2895399312. The cubic root of 245056781 is about 625.7808105829.

The spelling of 245056781 in words is "two hundred forty-five million, fifty-six thousand, seven hundred eighty-one".