12685651 has 4 divisors (see below), whose sum is σ = 13838904. Its totient is φ = 11532400.

The previous prime is 12685643. The next prime is 12685663. The reversal of 12685651 is 15658621.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15658621 = 11 ⋅1423511.

It is not a de Polignac number, because 12685651 - 2³ = 12685643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12685681) 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, 576610 + ... + 576631.

It is an arithmetic number, because the mean of its divisors is an integer number (3459726).

Almost surely, 2^12685651 is an apocalyptic number.

12685651 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12685651 is a deficient number, since it is larger than the sum of its proper divisors (1153253).

12685651 is a wasteful number, since it uses less digits than its factorization.

12685651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1153252.

The product of its digits is 14400, while the sum is 34.

The square root of 12685651 is about 3561.6921540189. The cubic root of 12685651 is about 233.2227541796. Note that the first 3 decimals are identical.

The spelling of 12685651 in words is "twelve million, six hundred eighty-five thousand, six hundred fifty-one".