13530661 has 2 divisors, whose sum is σ = 13530662. Its totient is φ = 13530660.

The previous prime is 13530659. The next prime is 13530701. The reversal of 13530661 is 16603531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9728161 + 3802500 = 3119^2 + 1950^2 .

It is a cyclic number.

It is not a de Polignac number, because 13530661 - 2¹ = 13530659 is a prime.

Together with 13530659, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13530611) 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, 6765330 + 6765331.

It is an arithmetic number, because the mean of its divisors is an integer number (6765331).

Almost surely, 2^13530661 is an apocalyptic number.

It is an amenable number.

13530661 is a deficient number, since it is larger than the sum of its proper divisors (1).

13530661 is an equidigital number, since it uses as much as digits as its factorization.

13530661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 13530661 is about 3678.4046813802. The cubic root of 13530661 is about 238.2902855837.

The spelling of 13530661 in words is "thirteen million, five hundred thirty thousand, six hundred sixty-one".