13921577 has 4 divisors (see below), whose sum is σ = 13942416. Its totient is φ = 13900740.

The previous prime is 13921571. The next prime is 13921643. The reversal of 13921577 is 77512931.

It is a happy number.

13921577 is digitally balanced in base 2, 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, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 77512931 = 1291 ⋅60041.

It is a cyclic number.

It is not a de Polignac number, because 13921577 - 2⁶ = 13921513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13921571) 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, 9383 + ... + 10764.

It is an arithmetic number, because the mean of its divisors is an integer number (3485604).

Almost surely, 2^13921577 is an apocalyptic number.

It is an amenable number.

13921577 is a deficient number, since it is larger than the sum of its proper divisors (20839).

13921577 is an equidigital number, since it uses as much as digits as its factorization.

13921577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20838.

The product of its digits is 13230, while the sum is 35.

The square root of 13921577 is about 3731.1629554336. The cubic root of 13921577 is about 240.5633582926.

The spelling of 13921577 in words is "thirteen million, nine hundred twenty-one thousand, five hundred seventy-seven".