10013981 has 2 divisors, whose sum is σ = 10013982. Its totient is φ = 10013980.

The previous prime is 10013959. The next prime is 10014031. The reversal of 10013981 is 18931001.

10013981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9665881 + 348100 = 3109^2 + 590^2 .

It is a cyclic number.

It is not a de Polignac number, because 10013981 - 2⁶ = 10013917 is a prime.

It is a super-2 number, since 2×10013981² = 200559630936722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10013951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5006990 + 5006991.

It is an arithmetic number, because the mean of its divisors is an integer number (5006991).

Almost surely, 2^10013981 is an apocalyptic number.

It is an amenable number.

10013981 is a deficient number, since it is larger than the sum of its proper divisors (1).

10013981 is an equidigital number, since it uses as much as digits as its factorization.

10013981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 23.

The square root of 10013981 is about 3164.4874782498. The cubic root of 10013981 is about 215.5438260860.

Adding to 10013981 its reverse (18931001), we get a palindrome (28944982).

The spelling of 10013981 in words is "ten million, thirteen thousand, nine hundred eighty-one".