245842781 has 2 divisors, whose sum is σ = 245842782. Its totient is φ = 245842780.

The previous prime is 245842777. The next prime is 245842783. The reversal of 245842781 is 187248542.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136305625 + 109537156 = 11675^2 + 10466^2 .

It is a cyclic number.

It is not a de Polignac number, because 245842781 - 2² = 245842777 is a prime.

It is a super-2 number, since 2×245842781² = 120877345939627922, which contains 22 as substring.

Together with 245842783, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (245842783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122921390 + 122921391.

It is an arithmetic number, because the mean of its divisors is an integer number (122921391).

Almost surely, 2^245842781 is an apocalyptic number.

It is an amenable number.

245842781 is a deficient number, since it is larger than the sum of its proper divisors (1).

245842781 is an equidigital number, since it uses as much as digits as its factorization.

245842781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 143360, while the sum is 41.

The square root of 245842781 is about 15679.3743816518. The cubic root of 245842781 is about 626.4491438279.

The spelling of 245842781 in words is "two hundred forty-five million, eight hundred forty-two thousand, seven hundred eighty-one".