13730881 has 2 divisors, whose sum is σ = 13730882. Its totient is φ = 13730880.

The previous prime is 13730867. The next prime is 13730887. The reversal of 13730881 is 18803731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7182400 + 6548481 = 2680^2 + 2559^2 .

It is an emirp because it is prime and its reverse (18803731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13730881 - 2¹⁷ = 13599809 is a prime.

It is a super-2 number, since 2×13730881² = 377074186072322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (13730887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6865440 + 6865441.

It is an arithmetic number, because the mean of its divisors is an integer number (6865441).

Almost surely, 2^13730881 is an apocalyptic number.

It is an amenable number.

13730881 is a deficient number, since it is larger than the sum of its proper divisors (1).

13730881 is an equidigital number, since it uses as much as digits as its factorization.

13730881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 13730881 is about 3705.5203413286. The cubic root of 13730881 is about 239.4599023705.

The spelling of 13730881 in words is "thirteen million, seven hundred thirty thousand, eight hundred eighty-one".