13620751 has 4 divisors (see below), whose sum is σ = 13844104. Its totient is φ = 13397400.

The previous prime is 13620727. The next prime is 13620781. The reversal of 13620751 is 15702631.

13620751 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13620751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13620721) 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, 111585 + ... + 111706.

It is an arithmetic number, because the mean of its divisors is an integer number (3461026).

Almost surely, 2^13620751 is an apocalyptic number.

13620751 is the 1651-st centered decagonal number.

13620751 is a deficient number, since it is larger than the sum of its proper divisors (223353).

13620751 is an equidigital number, since it uses as much as digits as its factorization.

13620751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223352.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 13620751 is about 3690.6301629938. The cubic root of 13620751 is about 238.8179785048.

The spelling of 13620751 in words is "thirteen million, six hundred twenty thousand, seven hundred fifty-one".