13813997 has 2 divisors, whose sum is σ = 13813998. Its totient is φ = 13813996.

The previous prime is 13813991. The next prime is 13814027. The reversal of 13813997 is 79931831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11485321 + 2328676 = 3389^2 + 1526^2 .

It is a cyclic number.

It is not a de Polignac number, because 13813997 - 2¹⁴ = 13797613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13813991) 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, 6906998 + 6906999.

It is an arithmetic number, because the mean of its divisors is an integer number (6906999).

Almost surely, 2^13813997 is an apocalyptic number.

It is an amenable number.

13813997 is a deficient number, since it is larger than the sum of its proper divisors (1).

13813997 is an equidigital number, since it uses as much as digits as its factorization.

13813997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 41.

The square root of 13813997 is about 3716.7185796076. The cubic root of 13813997 is about 239.9420983004.

The spelling of 13813997 in words is "thirteen million, eight hundred thirteen thousand, nine hundred ninety-seven".