13620851 has 4 divisors (see below), whose sum is σ = 13807512. Its totient is φ = 13434192.

The previous prime is 13620839. The next prime is 13620857. The reversal of 13620851 is 15802631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15802631 = 13 ⋅1215587.

It is a cyclic number.

It is not a de Polignac number, because 13620851 - 2⁶ = 13620787 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13620851.

It is not an unprimeable number, because it can be changed into a prime (13620857) 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, 93221 + ... + 93366.

It is an arithmetic number, because the mean of its divisors is an integer number (3451878).

Almost surely, 2^13620851 is an apocalyptic number.

13620851 is a deficient number, since it is larger than the sum of its proper divisors (186661).

13620851 is an equidigital number, since it uses as much as digits as its factorization.

13620851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186660.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 13620851 is about 3690.6437107908. The cubic root of 13620851 is about 238.8185629498.

The spelling of 13620851 in words is "thirteen million, six hundred twenty thousand, eight hundred fifty-one".