13981469 has 2 divisors, whose sum is σ = 13981470. Its totient is φ = 13981468.

The previous prime is 13981459. The next prime is 13981477. The reversal of 13981469 is 96418931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11142244 + 2839225 = 3338^2 + 1685^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13981469 is a prime.

It is a super-2 number, since 2×13981469² = 390962950795922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13981459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6990734 + 6990735.

It is an arithmetic number, because the mean of its divisors is an integer number (6990735).

Almost surely, 2^13981469 is an apocalyptic number.

It is an amenable number.

13981469 is a deficient number, since it is larger than the sum of its proper divisors (1).

13981469 is an equidigital number, since it uses as much as digits as its factorization.

13981469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 41.

The square root of 13981469 is about 3739.1802577570. The cubic root of 13981469 is about 240.9078405450.

The spelling of 13981469 in words is "thirteen million, nine hundred eighty-one thousand, four hundred sixty-nine".