16121169 has 12 divisors (see below), whose sum is σ = 23726196. Its totient is φ = 10544352.

The previous prime is 16121143. The next prime is 16121179. The reversal of 16121169 is 96112161.

It can be written as a sum of positive squares in 2 ways, for example, as 9072144 + 7049025 = 3012^2 + 2655^2 .

It is not a de Polignac number, because 16121169 - 2⁷ = 16121041 is a prime.

It is a super-2 number, since 2×16121169² = 519784179853122, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16121179) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16422 + ... + 17375.

It is an arithmetic number, because the mean of its divisors is an integer number (1977183).

Almost surely, 2^16121169 is an apocalyptic number.

It is an amenable number.

16121169 is a deficient number, since it is larger than the sum of its proper divisors (7605027).

16121169 is a wasteful number, since it uses less digits than its factorization.

16121169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33856 (or 33853 counting only the distinct ones).

The product of its digits is 648, while the sum is 27.

The square root of 16121169 is about 4015.1175574322. The cubic root of 16121169 is about 252.6187083561.

It can be divided in two parts, 16121 and 169, that added together give a triangular number (16290 = T₁₈₀).

The spelling of 16121169 in words is "sixteen million, one hundred twenty-one thousand, one hundred sixty-nine".