13538971 has 4 divisors (see below), whose sum is σ = 13975744. Its totient is φ = 13102200.

The previous prime is 13538957. The next prime is 13538983. The reversal of 13538971 is 17983531.

It is a happy number.

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 13538971 - 2⁷ = 13538843 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13538971.

It is not an unprimeable number, because it can be changed into a prime (13538071) 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, 218340 + ... + 218401.

It is an arithmetic number, because the mean of its divisors is an integer number (3493936).

Almost surely, 2^13538971 is an apocalyptic number.

13538971 is a deficient number, since it is larger than the sum of its proper divisors (436773).

13538971 is an equidigital number, since it uses as much as digits as its factorization.

13538971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436772.

The product of its digits is 22680, while the sum is 37.

The square root of 13538971 is about 3679.5340737653. The cubic root of 13538971 is about 238.3390584418.

It can be divided in two parts, 135389 and 71, that added together give a triangular number (135460 = T₅₂₀).

The spelling of 13538971 in words is "thirteen million, five hundred thirty-eight thousand, nine hundred seventy-one".