245698681 has 2 divisors, whose sum is σ = 245698682. Its totient is φ = 245698680.

The previous prime is 245698679. The next prime is 245698693. The reversal of 245698681 is 186896542.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 244453225 + 1245456 = 15635^2 + 1116^2 .

It is a cyclic number.

It is not a de Polignac number, because 245698681 - 2¹ = 245698679 is a prime.

It is a super-2 number, since 2×245698681² = 120735683690279522, which contains 22 as substring.

Together with 245698679, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (245698081) 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, 122849340 + 122849341.

It is an arithmetic number, because the mean of its divisors is an integer number (122849341).

Almost surely, 2^245698681 is an apocalyptic number.

It is an amenable number.

245698681 is a deficient number, since it is larger than the sum of its proper divisors (1).

245698681 is an equidigital number, since it uses as much as digits as its factorization.

245698681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 829440, while the sum is 49.

The square root of 245698681 is about 15674.7784992325. The cubic root of 245698681 is about 626.3267228177.

The spelling of 245698681 in words is "two hundred forty-five million, six hundred ninety-eight thousand, six hundred eighty-one".