245026781 has 2 divisors, whose sum is σ = 245026782. Its totient is φ = 245026780.

The previous prime is 245026757. The next prime is 245026799. The reversal of 245026781 is 187620542.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 162052900 + 82973881 = 12730^2 + 9109^2 .

It is a cyclic number.

It is not a de Polignac number, because 245026781 - 2¹⁴ = 245010397 is a prime.

It is a super-2 number, since 2×245026781² = 120076246814443922, 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 (245026711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122513390 + 122513391.

It is an arithmetic number, because the mean of its divisors is an integer number (122513391).

Almost surely, 2^245026781 is an apocalyptic number.

It is an amenable number.

245026781 is a deficient number, since it is larger than the sum of its proper divisors (1).

245026781 is an equidigital number, since it uses as much as digits as its factorization.

245026781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 245026781 is about 15653.3313067858. The cubic root of 245026781 is about 625.7552733851.

The spelling of 245026781 in words is "two hundred forty-five million, twenty-six thousand, seven hundred eighty-one".