2305285981 has 2 divisors, whose sum is σ = 2305285982. Its totient is φ = 2305285980.

The previous prime is 2305285963. The next prime is 2305285987. The reversal of 2305285981 is 1895825032.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2251028025 + 54257956 = 47445^2 + 7366^2 .

It is a cyclic number.

It is not a de Polignac number, because 2305285981 - 2¹¹ = 2305283933 is a prime.

It is a super-2 number, since 2×2305285981² = 10628686908390264722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2305285987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1152642990 + 1152642991.

It is an arithmetic number, because the mean of its divisors is an integer number (1152642991).

Almost surely, 2^2305285981 is an apocalyptic number.

It is an amenable number.

2305285981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2305285981 is an equidigital number, since it uses as much as digits as its factorization.

2305285981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 172800, while the sum is 43.

The square root of 2305285981 is about 48013.3937667397. The cubic root of 2305285981 is about 1321.0165839294.

The spelling of 2305285981 in words is "two billion, three hundred five million, two hundred eighty-five thousand, nine hundred eighty-one".