13970881 has 2 divisors, whose sum is σ = 13970882. Its totient is φ = 13970880.

The previous prime is 13970851. The next prime is 13970897. The reversal of 13970881 is 18807931.

13970881 is digitally balanced in base 2 and base 3, because in such bases 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., 10784656 + 3186225 = 3284^2 + 1785^2 .

It is an emirp because it is prime and its reverse (18807931) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13970881 is a prime.

It is a super-2 number, since 2×13970881² = 390371031832322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13970881.

It is not a weakly prime, because it can be changed into another prime (13970851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6985440 + 6985441.

It is an arithmetic number, because the mean of its divisors is an integer number (6985441).

Almost surely, 2^13970881 is an apocalyptic number.

It is an amenable number.

13970881 is a deficient number, since it is larger than the sum of its proper divisors (1).

13970881 is an equidigital number, since it uses as much as digits as its factorization.

13970881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 13970881 is about 3737.7641712660. The cubic root of 13970881 is about 240.8470129747.

The spelling of 13970881 in words is "thirteen million, nine hundred seventy thousand, eight hundred eighty-one".