13616861 has 2 divisors, whose sum is σ = 13616862. Its totient is φ = 13616860.

The previous prime is 13616833. The next prime is 13616891. The reversal of 13616861 is 16861631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13579225 + 37636 = 3685^2 + 194^2 .

It is an emirp because it is prime and its reverse (16861631) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13616861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13616821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6808430 + 6808431.

It is an arithmetic number, because the mean of its divisors is an integer number (6808431).

Almost surely, 2^13616861 is an apocalyptic number.

It is an amenable number.

13616861 is a deficient number, since it is larger than the sum of its proper divisors (1).

13616861 is an equidigital number, since it uses as much as digits as its factorization.

13616861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 32.

The square root of 13616861 is about 3690.1031150904. The cubic root of 13616861 is about 238.7952413740.

The spelling of 13616861 in words is "thirteen million, six hundred sixteen thousand, eight hundred sixty-one".