13634681 has 2 divisors, whose sum is σ = 13634682. Its totient is φ = 13634680.

The previous prime is 13634639. The next prime is 13634707. The reversal of 13634681 is 18643631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9554281 + 4080400 = 3091^2 + 2020^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13634681 is a prime.

It is a super-2 number, since 2×13634681² = 371809051943522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13634081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6817340 + 6817341.

It is an arithmetic number, because the mean of its divisors is an integer number (6817341).

Almost surely, 2^13634681 is an apocalyptic number.

It is an amenable number.

13634681 is a deficient number, since it is larger than the sum of its proper divisors (1).

13634681 is an equidigital number, since it uses as much as digits as its factorization.

13634681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 32.

The square root of 13634681 is about 3692.5168923107. The cubic root of 13634681 is about 238.8993641542.

The spelling of 13634681 in words is "thirteen million, six hundred thirty-four thousand, six hundred eighty-one".