16031121 has 4 divisors (see below), whose sum is σ = 21374832. Its totient is φ = 10687412.

The previous prime is 16031107. The next prime is 16031137. The reversal of 16031121 is 12113061.

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 16031121 - 2¹⁰ = 16030097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16031121.

It is not an unprimeable number, because it can be changed into a prime (16031921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2671851 + ... + 2671856.

It is an arithmetic number, because the mean of its divisors is an integer number (5343708).

Almost surely, 2^16031121 is an apocalyptic number.

It is an amenable number.

16031121 is a deficient number, since it is larger than the sum of its proper divisors (5343711).

16031121 is an equidigital number, since it uses as much as digits as its factorization.

16031121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5343710.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 16031121 is about 4003.8882352034. Note that the first 3 decimals coincide. The cubic root of 16031121 is about 252.1474791809.

Adding to 16031121 its reverse (12113061), we get a palindrome (28144182).

The spelling of 16031121 in words is "sixteen million, thirty-one thousand, one hundred twenty-one".