16135121 has 4 divisors (see below), whose sum is σ = 16836672. Its totient is φ = 15433572.

The previous prime is 16135109. The next prime is 16135169. The reversal of 16135121 is 12153161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16135121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16135093 and 16135102.

It is not an unprimeable number, because it can be changed into a prime (16135321) 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, 350741 + ... + 350786.

It is an arithmetic number, because the mean of its divisors is an integer number (4209168).

Almost surely, 2^16135121 is an apocalyptic number.

It is an amenable number.

16135121 is a deficient number, since it is larger than the sum of its proper divisors (701551).

16135121 is an equidigital number, since it uses as much as digits as its factorization.

16135121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 701550.

The product of its digits is 180, while the sum is 20.

The square root of 16135121 is about 4016.8546152431. The cubic root of 16135121 is about 252.6915632866.

Adding to 16135121 its reverse (12153161), we get a palindrome (28288282).

The spelling of 16135121 in words is "sixteen million, one hundred thirty-five thousand, one hundred twenty-one".