16131121 has 4 divisors (see below), whose sum is σ = 16371952. Its totient is φ = 15890292.

The previous prime is 16131109. The next prime is 16131127. The reversal of 16131121 is 12113161.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12113161 = 3023 ⋅4007.

It is a cyclic number.

It is not a de Polignac number, because 16131121 - 2⁷ = 16130993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16131095 and 16131104.

It is not an unprimeable number, because it can be changed into a prime (16131127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120315 + ... + 120448.

It is an arithmetic number, because the mean of its divisors is an integer number (4092988).

Almost surely, 2^16131121 is an apocalyptic number.

It is an amenable number.

16131121 is a deficient number, since it is larger than the sum of its proper divisors (240831).

16131121 is an equidigital number, since it uses as much as digits as its factorization.

16131121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240830.

The product of its digits is 36, while the sum is 16.

The square root of 16131121 is about 4016.3566823677. The cubic root of 16131121 is about 252.6706802743.

Adding to 16131121 its reverse (12113161), we get a palindrome (28244282).

The spelling of 16131121 in words is "sixteen million, one hundred thirty-one thousand, one hundred twenty-one".