13978569331 has 2 divisors, whose sum is σ = 13978569332. Its totient is φ = 13978569330.

The previous prime is 13978569317. The next prime is 13978569337. The reversal of 13978569331 is 13396587931.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (13396587931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13978569331 - 2⁷ = 13978569203 is a prime.

It is a super-2 number, since 2×13978569331² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (13978569337) 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, 6989284665 + 6989284666.

It is an arithmetic number, because the mean of its divisors is an integer number (6989284666).

Almost surely, 2^13978569331 is an apocalyptic number.

13978569331 is a deficient number, since it is larger than the sum of its proper divisors (1).

13978569331 is an equidigital number, since it uses as much as digits as its factorization.

13978569331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3674160, while the sum is 55.

The spelling of 13978569331 in words is "thirteen billion, nine hundred seventy-eight million, five hundred sixty-nine thousand, three hundred thirty-one".