4000000981 has 2 divisors, whose sum is σ = 4000000982. Its totient is φ = 4000000980.

The previous prime is 4000000951. The next prime is 4000001003. The reversal of 4000000981 is 1890000004.

4000000981 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (4000001003) can be obtained adding 4000000981 to its sum of digits (22).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3938692081 + 61308900 = 62759^2 + 7830^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4000000981 is a prime.

It is a super-2 number, since 2×4000000981² = 32000015696001924722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4000000951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2000000490 + 2000000491.

It is an arithmetic number, because the mean of its divisors is an integer number (2000000491).

Almost surely, 2^4000000981 is an apocalyptic number.

It is an amenable number.

4000000981 is a deficient number, since it is larger than the sum of its proper divisors (1).

4000000981 is an equidigital number, since it uses as much as digits as its factorization.

4000000981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 4000000981 is about 63245.5609588531. The cubic root of 4000000981 is about 1587.4011817382.

Adding to 4000000981 its reverse (1890000004), we get a palindrome (5890000985).

The spelling of 4000000981 in words is "four billion, nine hundred eighty-one", and thus it is an aban number.