245856817 has 2 divisors, whose sum is σ = 245856818. Its totient is φ = 245856816.

The previous prime is 245856811. The next prime is 245856829. The reversal of 245856817 is 718658542.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130165281 + 115691536 = 11409^2 + 10756^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-245856817 is a prime.

It is not a weakly prime, because it can be changed into another prime (245856811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122928408 + 122928409.

It is an arithmetic number, because the mean of its divisors is an integer number (122928409).

Almost surely, 2^245856817 is an apocalyptic number.

It is an amenable number.

245856817 is a deficient number, since it is larger than the sum of its proper divisors (1).

245856817 is an equidigital number, since it uses as much as digits as its factorization.

245856817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 537600, while the sum is 46.

The square root of 245856817 is about 15679.8219696526. The cubic root of 245856817 is about 626.4610656380.

The spelling of 245856817 in words is "two hundred forty-five million, eight hundred fifty-six thousand, eight hundred seventeen".