13375521 has 12 divisors (see below), whose sum is σ = 19408272. Its totient is φ = 8876376.

The previous prime is 13375519. The next prime is 13375559. The reversal of 13375521 is 12557331.

13375521 is a `hidden beast` number, since 133 + 7 + 5 + 521 = 666.

It is not a de Polignac number, because 13375521 - 2¹ = 13375519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13375511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1231 + ... + 5316.

It is an arithmetic number, because the mean of its divisors is an integer number (1617356).

Almost surely, 2^13375521 is an apocalyptic number.

It is an amenable number.

13375521 is a deficient number, since it is larger than the sum of its proper divisors (6032751).

13375521 is a wasteful number, since it uses less digits than its factorization.

13375521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6780 (or 6777 counting only the distinct ones).

The product of its digits is 3150, while the sum is 27.

The square root of 13375521 is about 3657.2559385419. The cubic root of 13375521 is about 237.3760520374.

The spelling of 13375521 in words is "thirteen million, three hundred seventy-five thousand, five hundred twenty-one".