13523971 has 4 divisors (see below), whose sum is σ = 13573072. Its totient is φ = 13474872.

The previous prime is 13523969. The next prime is 13523989. The reversal of 13523971 is 17932531.

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

It is a cyclic number.

It is not a de Polignac number, because 13523971 - 2¹ = 13523969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13523911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24135 + ... + 24688.

It is an arithmetic number, because the mean of its divisors is an integer number (3393268).

Almost surely, 2^13523971 is an apocalyptic number.

13523971 is a deficient number, since it is larger than the sum of its proper divisors (49101).

13523971 is an equidigital number, since it uses as much as digits as its factorization.

13523971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49100.

The product of its digits is 5670, while the sum is 31.

The square root of 13523971 is about 3677.4952073388. The cubic root of 13523971 is about 238.2510062803.

The spelling of 13523971 in words is "thirteen million, five hundred twenty-three thousand, nine hundred seventy-one".