13573121 has 4 divisors (see below), whose sum is σ = 13659732. Its totient is φ = 13486512.

The previous prime is 13573099. The next prime is 13573129. The reversal of 13573121 is 12137531.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2755600 + 10817521 = 1660^2 + 3289^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13573121 is a prime.

It is a super-2 number, since 2×13573121² = 368459227361282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13573129) 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, 43070 + ... + 43383.

It is an arithmetic number, because the mean of its divisors is an integer number (3414933).

Almost surely, 2^13573121 is an apocalyptic number.

It is an amenable number.

13573121 is a deficient number, since it is larger than the sum of its proper divisors (86611).

13573121 is an equidigital number, since it uses as much as digits as its factorization.

13573121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86610.

The product of its digits is 630, while the sum is 23.

The square root of 13573121 is about 3684.1716843817. The cubic root of 13573121 is about 238.5392815620.

The spelling of 13573121 in words is "thirteen million, five hundred seventy-three thousand, one hundred twenty-one".