3849457981 has 2 divisors, whose sum is σ = 3849457982. Its totient is φ = 3849457980.

The previous prime is 3849457933. The next prime is 3849457987. The reversal of 3849457981 is 1897549483.

3849457981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2268997956 + 1580460025 = 47634^2 + 39755^2 .

It is an emirp because it is prime and its reverse (1897549483) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3849457981 - 2²³ = 3841069373 is a prime.

It is a super-2 number, since 2×3849457981² = 29636653494969192722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3849457987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1924728990 + 1924728991.

It is an arithmetic number, because the mean of its divisors is an integer number (1924728991).

Almost surely, 2^3849457981 is an apocalyptic number.

It is an amenable number.

3849457981 is a deficient number, since it is larger than the sum of its proper divisors (1).

3849457981 is an equidigital number, since it uses as much as digits as its factorization.

3849457981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8709120, while the sum is 58.

The square root of 3849457981 is about 62044.0003626459. Note that the first 3 decimals coincide. The cubic root of 3849457981 is about 1567.2316532086.

The spelling of 3849457981 in words is "three billion, eight hundred forty-nine million, four hundred fifty-seven thousand, nine hundred eighty-one".