13858981 has 2 divisors, whose sum is σ = 13858982. Its totient is φ = 13858980.

The previous prime is 13858969. The next prime is 13858993. The reversal of 13858981 is 18985831.

It is a balanced prime because it is at equal distance from previous prime (13858969) and next prime (13858993).

It can be written as a sum of positive squares in only one way, i.e., 11189025 + 2669956 = 3345^2 + 1634^2 .

It is an emirp because it is prime and its reverse (18985831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13858981 - 2⁹ = 13858469 is a prime.

It is a super-2 number, since 2×13858981² = 384142708716722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13858921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6929490 + 6929491.

It is an arithmetic number, because the mean of its divisors is an integer number (6929491).

Almost surely, 2^13858981 is an apocalyptic number.

It is an amenable number.

13858981 is a deficient number, since it is larger than the sum of its proper divisors (1).

13858981 is an equidigital number, since it uses as much as digits as its factorization.

13858981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 43.

The square root of 13858981 is about 3722.7652356817. The cubic root of 13858981 is about 240.2022658303.

The spelling of 13858981 in words is "thirteen million, eight hundred fifty-eight thousand, nine hundred eighty-one".