13613987 has 2 divisors, whose sum is σ = 13613988. Its totient is φ = 13613986.

The previous prime is 13613983. The next prime is 13613993. The reversal of 13613987 is 78931631.

It is a weak prime.

It is an emirp because it is prime and its reverse (78931631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13613987 - 2² = 13613983 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13613987.

It is not a weakly prime, because it can be changed into another prime (13613983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6806993 + 6806994.

It is an arithmetic number, because the mean of its divisors is an integer number (6806994).

Almost surely, 2^13613987 is an apocalyptic number.

13613987 is a deficient number, since it is larger than the sum of its proper divisors (1).

13613987 is an equidigital number, since it uses as much as digits as its factorization.

13613987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 38.

The square root of 13613987 is about 3689.7136745281. The cubic root of 13613987 is about 238.7784400027.

The spelling of 13613987 in words is "thirteen million, six hundred thirteen thousand, nine hundred eighty-seven".