13613081 has 2 divisors, whose sum is σ = 13613082. Its totient is φ = 13613080.

The previous prime is 13613071. The next prime is 13613099. The reversal of 13613081 is 18031631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13579225 + 33856 = 3685^2 + 184^2 .

It is a cyclic number.

It is not a de Polignac number, because 13613081 - 2²² = 9418777 is a prime.

It is a super-2 number, since 2×13613081² = 370631948625122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (13613021) 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, 6806540 + 6806541.

It is an arithmetic number, because the mean of its divisors is an integer number (6806541).

Almost surely, 2^13613081 is an apocalyptic number.

It is an amenable number.

13613081 is a deficient number, since it is larger than the sum of its proper divisors (1).

13613081 is an equidigital number, since it uses as much as digits as its factorization.

13613081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 13613081 is about 3689.5908987312. The cubic root of 13613081 is about 238.7731430468.

The spelling of 13613081 in words is "thirteen million, six hundred thirteen thousand, eighty-one".