16539121 has 4 divisors (see below), whose sum is σ = 16640752. Its totient is φ = 16437492.

The previous prime is 16539119. The next prime is 16539163. The reversal of 16539121 is 12193561.

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 not a de Polignac number, because 16539121 - 2¹ = 16539119 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 16539121.

It is not an unprimeable number, because it can be changed into a prime (16539191) 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, 50571 + ... + 50896.

It is an arithmetic number, because the mean of its divisors is an integer number (4160188).

Almost surely, 2^16539121 is an apocalyptic number.

It is an amenable number.

16539121 is a deficient number, since it is larger than the sum of its proper divisors (101631).

16539121 is a wasteful number, since it uses less digits than its factorization.

16539121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101630.

The product of its digits is 1620, while the sum is 28.

The square root of 16539121 is about 4066.8318135866. The cubic root of 16539121 is about 254.7832118796.

The spelling of 16539121 in words is "sixteen million, five hundred thirty-nine thousand, one hundred twenty-one".