13751621 has 8 divisors (see below), whose sum is σ = 14838264. Its totient is φ = 12669120.

The previous prime is 13751603. The next prime is 13751629. The reversal of 13751621 is 12615731.

13751621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 2927521 + 10824100 = 1711^2 + 3290^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13751621 - 2⁶ = 13751557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13751629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12431 + ... + 13491.

It is an arithmetic number, because the mean of its divisors is an integer number (1854783).

Almost surely, 2^13751621 is an apocalyptic number.

It is an amenable number.

13751621 is a deficient number, since it is larger than the sum of its proper divisors (1086643).

13751621 is a wasteful number, since it uses less digits than its factorization.

13751621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2071.

The product of its digits is 1260, while the sum is 26.

The square root of 13751621 is about 3708.3178127016. The cubic root of 13751621 is about 239.5804068973.

The spelling of 13751621 in words is "thirteen million, seven hundred fifty-one thousand, six hundred twenty-one".