13661699 has 4 divisors (see below), whose sum is σ = 13737360. Its totient is φ = 13586040.

The previous prime is 13661689. The next prime is 13661759. The reversal of 13661699 is 99616631.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13661699 - 2²⁰ = 12613123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13661689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37559 + ... + 37920.

It is an arithmetic number, because the mean of its divisors is an integer number (3434340).

Almost surely, 2^13661699 is an apocalyptic number.

13661699 is a deficient number, since it is larger than the sum of its proper divisors (75661).

13661699 is an equidigital number, since it uses as much as digits as its factorization.

13661699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75660.

The product of its digits is 52488, while the sum is 41.

The square root of 13661699 is about 3696.1735619421. The cubic root of 13661699 is about 239.0570582070.

The spelling of 13661699 in words is "thirteen million, six hundred sixty-one thousand, six hundred ninety-nine".