245765381 has 2 divisors, whose sum is σ = 245765382. Its totient is φ = 245765380.

The previous prime is 245765353. The next prime is 245765417. The reversal of 245765381 is 183567542.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 216237025 + 29528356 = 14705^2 + 5434^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-245765381 is a prime.

It is a super-2 number, since 2×245765381² = 120801244996150322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (245765321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122882690 + 122882691.

It is an arithmetic number, because the mean of its divisors is an integer number (122882691).

Almost surely, 2^245765381 is an apocalyptic number.

It is an amenable number.

245765381 is a deficient number, since it is larger than the sum of its proper divisors (1).

245765381 is an equidigital number, since it uses as much as digits as its factorization.

245765381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 201600, while the sum is 41.

The square root of 245765381 is about 15676.9059766269. The cubic root of 245765381 is about 626.3833941471.

The spelling of 245765381 in words is "two hundred forty-five million, seven hundred sixty-five thousand, three hundred eighty-one".