13981969 has 2 divisors, whose sum is σ = 13981970. Its totient is φ = 13981968.

The previous prime is 13981951. The next prime is 13981991. The reversal of 13981969 is 96918931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13542400 + 439569 = 3680^2 + 663^2 .

It is a cyclic number.

It is not a de Polignac number, because 13981969 - 2⁵ = 13981937 is a prime.

It is a super-2 number, since 2×13981969² = 390990914233922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (13981469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6990984 + 6990985.

It is an arithmetic number, because the mean of its divisors is an integer number (6990985).

Almost surely, 2^13981969 is an apocalyptic number.

It is an amenable number.

13981969 is a deficient number, since it is larger than the sum of its proper divisors (1).

13981969 is an equidigital number, since it uses as much as digits as its factorization.

13981969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 104976, while the sum is 46.

The square root of 13981969 is about 3739.2471167335. The cubic root of 13981969 is about 240.9107122624.

The spelling of 13981969 in words is "thirteen million, nine hundred eighty-one thousand, nine hundred sixty-nine".