13992521 has 4 divisors (see below), whose sum is σ = 14333844. Its totient is φ = 13651200.

The previous prime is 13992509. The next prime is 13992523. The reversal of 13992521 is 12529931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12529931 = 1301 ⋅9631.

It can be written as a sum of positive squares in 2 ways, for example, as 8179600 + 5812921 = 2860^2 + 2411^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13992521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13992523) 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, 170600 + ... + 170681.

It is an arithmetic number, because the mean of its divisors is an integer number (3583461).

Almost surely, 2^13992521 is an apocalyptic number.

It is an amenable number.

13992521 is a deficient number, since it is larger than the sum of its proper divisors (341323).

13992521 is an equidigital number, since it uses as much as digits as its factorization.

13992521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341322.

The product of its digits is 4860, while the sum is 32.

The square root of 13992521 is about 3740.6578298476. The cubic root of 13992521 is about 240.9713010252.

The spelling of 13992521 in words is "thirteen million, nine hundred ninety-two thousand, five hundred twenty-one".