13680651 has 4 divisors (see below), whose sum is σ = 18240872. Its totient is φ = 9120432.

The previous prime is 13680647. The next prime is 13680661. The reversal of 13680651 is 15608631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15608631 = 3 ⋅5202877.

It is not a de Polignac number, because 13680651 - 2² = 13680647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13680661) 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, 2280106 + ... + 2280111.

It is an arithmetic number, because the mean of its divisors is an integer number (4560218).

Almost surely, 2^13680651 is an apocalyptic number.

13680651 is a deficient number, since it is larger than the sum of its proper divisors (4560221).

13680651 is an equidigital number, since it uses as much as digits as its factorization.

13680651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4560220.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 13680651 is about 3698.7364058554. The cubic root of 13680651 is about 239.1675499785.

The spelling of 13680651 in words is "thirteen million, six hundred eighty thousand, six hundred fifty-one".