4845731981 has 2 divisors, whose sum is σ = 4845731982. Its totient is φ = 4845731980.

The previous prime is 4845731911. The next prime is 4845731993. The reversal of 4845731981 is 1891375484.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4351381225 + 494350756 = 65965^2 + 22234^2 .

It is a cyclic number.

It is not a de Polignac number, because 4845731981 - 2²⁶ = 4778623117 is a prime.

It is a super-2 number, since 2×4845731981² = 46962236863372368722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4845731911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2422865990 + 2422865991.

It is an arithmetic number, because the mean of its divisors is an integer number (2422865991).

Almost surely, 2^4845731981 is an apocalyptic number.

It is an amenable number.

4845731981 is a deficient number, since it is larger than the sum of its proper divisors (1).

4845731981 is an equidigital number, since it uses as much as digits as its factorization.

4845731981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 967680, while the sum is 50.

The square root of 4845731981 is about 69611.2920509309. The cubic root of 4845731981 is about 1692.2056074391.

The spelling of 4845731981 in words is "four billion, eight hundred forty-five million, seven hundred thirty-one thousand, nine hundred eighty-one".