13660531 has 2 divisors, whose sum is σ = 13660532. Its totient is φ = 13660530.

The previous prime is 13660529. The next prime is 13660547. The reversal of 13660531 is 13506631.

13660531 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (13506631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13660531 - 2¹ = 13660529 is a prime.

It is a super-2 number, since 2×13660531² = 373220214403922, which contains 22 as substring.

Together with 13660529, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 13660496 and 13660505.

It is not a weakly prime, because it can be changed into another prime (13660561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6830265 + 6830266.

It is an arithmetic number, because the mean of its divisors is an integer number (6830266).

Almost surely, 2^13660531 is an apocalyptic number.

13660531 is a deficient number, since it is larger than the sum of its proper divisors (1).

13660531 is an equidigital number, since it uses as much as digits as its factorization.

13660531 is an evil number, because the sum of its binary digits is even.

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

The square root of 13660531 is about 3696.0155573266. The cubic root of 13660531 is about 239.0502453257.

The spelling of 13660531 in words is "thirteen million, six hundred sixty thousand, five hundred thirty-one".