13145681 has 2 divisors, whose sum is σ = 13145682. Its totient is φ = 13145680.

The previous prime is 13145651. The next prime is 13145723. The reversal of 13145681 is 18654131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13075456 + 70225 = 3616^2 + 265^2 .

It is a cyclic number.

It is not a de Polignac number, because 13145681 - 2⁶ = 13145617 is a prime.

It is a super-2 number, since 2×13145681² = 345617857907522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13145611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6572840 + 6572841.

It is an arithmetic number, because the mean of its divisors is an integer number (6572841).

Almost surely, 2^13145681 is an apocalyptic number.

It is an amenable number.

13145681 is a deficient number, since it is larger than the sum of its proper divisors (1).

13145681 is an equidigital number, since it uses as much as digits as its factorization.

13145681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 29.

The square root of 13145681 is about 3625.6973122422. The cubic root of 13145681 is about 236.0085281319.

The spelling of 13145681 in words is "thirteen million, one hundred forty-five thousand, six hundred eighty-one".